you might check on how teeny and what kind they are, and your country's laws regarding the sale of baby reptiles. some, ESPECIALLY BABY TURTLES and tortoises are IIIILLLLEGAL! to sell in pet stores in the U.S. i haven't looked into laws outside the us though.
It really depends, I think all turtles selling (as pets) is illegal (in America anyway) because they can carry salmonella (I think, I don't really clearly remember to be honest). That's why when you see them being sold they're being sold for "scientific purposes only". It's not illegal to own one though, just sell them as pets. (Yay pet store loopholes).
I have seen tortoises for sell at a rather large and well known reptile house in San Fransisco while visiting my mom too. I didn't look at all the kinds they had, I was mostly enamored by the BEAUTIFUL monitor lizards, skinks, geckos...ect. Turtles and Tortoises are cute, but they got nothing on lizards and snakes.
They had a pair of big tortoises, I forgot the species they were but my mom has a pair of baby ones. I really wish she hadn't gotten them though cause sure they were only about 2 inches long when she got them but now a year later they're more than twice that, and 10 years from now they'll be at least 2 feet long and may be pushing 100+ pounds. She says they'll give them to the zoo once they get bigger. *sigh*