Well, even though I do not have a KeiTama, I got the passwords!

*binary: organised into categories, improved descriptions, and added Akai-series passwords*

passwords are followed by description, then price

Meals & Snacks
00010 00001 melon 1200
00020 00002 lobster 1100
00030 00003 escargot 900
00040 00004 squid 700
00050 00005 pastry 520
00060 00006 crepe 530
00070 00007 creme puff 150
00080 00008 octopus-shaped hotdog 100
00090 00009 fish sausage 130

Seasonal & Locale-specific Meals, Snacks, and Items
00001 00001 New Years' seafood 600 January
00011 00002 chocolate 750 February
00021 00003 cookie 760 March
00031 00004 ume (pickled plums) 560 June
00041 00005 flavored shaved ice 530 August
00051 00006 baked potato 600 October
00061 00007 Christmas cake 880 December
00071 00008 corn on the cob 300
00081 00009 can of sealion meat 830
00091 00000 cherries 250
00002 00002 zunda mochi 780
00012 00003 natto 150
00022 00004 wind chime 1200
00032 00005 peanuts 540
00042 00006 fried shrimp 720
00052 00007 toast 200
00062 00008 monkey-shaped cookie 1300
00072 00009 tako-yaki 600
00082 00000 rice cracker 160
00092 00001 Buddha statue 1450
00003 00003 oyster 950
00013 00004 seafood 180
00023 00005 pig feet 850
00033 00006 shochu (liquor) 1000

Character-Specific Items
00014 00005 balloon 350
00024 00006 ball 150
00034 00007 skipping rope 540
00044 00008 trumpet 1200
00054 00009 plush toy bunny 300
00064 00000 computer 1500
00074 00001 eye glasses 600
00084 00002 top hat 540
00094 00003 roller skates 1120
00005 00005 hoola skirt 1250
00015 00006 wig 560
00025 00007 sunglasses 520
00035 00008 fan 1000
00045 00009 bathtub 1200
00055 00000 kerchief 520
00065 00001 sword 1300
00075 00002 fighting sticks 570
00085 00003 cotton fluff 1350
00095 00004 camera 1450
00006 00006 shaver 1300

Fancy Goods
00016 00007 love potion 1700
00026 00008 preventative medicine 2300
00036 00009 diet potion 2100
00046 00000 grave 5000
00056 00001 palace 9999

Travel Tickets
00028 00000 Europe 1600
00038 00001 South America 2000
00048 00002 Oceania 1800
00068 00004 Africa 1850
00078 00005 North America 1650

Note: the above passwords are for both the regular KeiTama Tamagotchis and KeiTama Akai Series Tamagotchis. Regular KeiTamas have screens with black pixels. Akai Series have screens with red pixels. Mostly, characters on the two are the same, but a few have been replaced with red-themed ones on the Akai Series.

Free Items for regular KeiTama
07374 54648 heart key
07374 55647 heart
07374 56646 star
07374 57645 plush Hello Kitty (only on KeiTama made up to March 2005)
07374 57645 plush toy animal (on KeiTama made since April 2005)
07374 58644 Fuji TV logo (only on KeiTama made up to March 2005)
07374 58644 wooden doll (on KeiTama made since April 2005)
07374 59643 Ciao comic book
07384 20006 mobile phone
07384 21005 tire
07374 53649 bottle of pop

Free Items for KeiTama Akai Series
07374 54648 heart key
07374 55647 ring
07374 56646 flute
07374 57645 plush toy animal
07374 58644 wooden doll
07374 59643 Ciao comic book
07384 20006 mobile phone
07384 21005 soccer ball
07374 53649 bottle of pop

In the KeiTama, when you go to put in the password, you use the "10" as the last 2 numbers on the first row and the "1" as the last number on the 2nd row (or whatever the password was) MOST of the KeiTama passwords also work for the KeiTama Akai (which is what I have)

You can only find KeiTamas in ebay, YesAsia (neither of those very often) or Jason's store. You are more likely to find them in Jason's store, along with quite a few other nice tamas, including Angels, Oceans, Lotterias, EnTamas, and the list goes on and on.

KM

The KeiTama is a second-generation Japanese Tamagotchi Plus. It was released in November 2004. The KeiTama has an antenna-shape built into the side of its case just like the Connection/Connexion V3. The first generation Tamagotchi Plus didn't have an antenna.

The KeiTama is obsolete. Its successor, the EnTama, was released in November 2005.

The KeiTama is no longer available for purchase in stores in Japan. If you really want one, try searching for "Tamagotchi Plus" in e-bay. Or, if you can read Japanese, try auctions.yahoo.co.jp (If you can't read Japanese, you might want to avoid the KeiTama since all the documentation and menus are in Japanese.)

In order to use these passwords you must have a KeiTama. See my previous post, just above this one, for more details on what a KeiTama is.

Sometimes you see KeiTama passwords posted like this:
16-7 love potion
56-1 palace

Those are abbreviated passwords. When you use them, you'll have to expand them to their full size, like this:
00016 00007 love potion
00056 00001 palace

To enter the password into a KeiTama:
(1) When no icons are lit up, press the KeiTama's left button until the Heart icon in the top right corner of its screen is highlighted.
(2) Press the middle button on the KeiTama The first menu will appear. It has four selections.
(3) At the first menu, press the left button to move the selector arrow down until it is beside the bottom entry.
(4) Press the middle button to advance to a second menu. The second menu has two selections.
(5) At the second menu, press the left button to move the selector arrow until it is beside the top entry.
(6) Press the middle button to advance to a third menu. The third menu also has two selections.
(7) At the third menu, press the left button to move the selector arrow until it is beside the top entry.
(8) Press the middle button to advance to the password input screen. You will see a screen with a blinking cursor.
(9) Pressing the left button will change cycle through the numbers for the digit that the cursor is on. Pressing the middle button will advance the cursor to the next digit. Pressing the right button will move the cursor to the previous digit in the password. If you press the right button while the cursor is already on the first digit, it will take you back up through the menu layers. After entering the last digit of the password, press the right button. Your selected item will arrive by post soon.
(10) If it's a purchase item, press the middle button to advance to the menu which allows you to accept or decline the purchase. The top entry is for if you want to buy it, and the bottom entry is for when you want to send it back.
(11) Use the left button to move the arrow, and the middle button to indicate your selection.