Tamagotchi is no longer sold in stores. they were discontinued in 2010.
However Japan still makes tamagotchis. downsides as the prices to get them here and they're in japanese.
and you can only buy them online in places such as Ebay, Amazon and japanese import sites.
in order from left to right those tamagotchis are
Tamagotchi Connection Version 5
Tamagotchi Connection Version 3
Tamagotchi Connection Version 5.5
the version 5 and 5.5 are the same tamagotchi essentially. the v5 just has a few different characters and some other minor details.
you can view guides for them here:
Guide for tamagotchi v5: http://www.tamatalk....s-tricks-index/
Guide for tamagotchi v3: http://www.tamatalk....otchi-v3-guide/
heres the whole topic if you wanted to poke around: http://www.tamatalk....ips-and-tricks/