I saw a Chinese man on the street once selling bunnies but not since. I have since decided I would like one as a pet. Does anyone know where I could catch a vendor like this or have any general advice for me? Thanks!

Advice:
Dont do it!

Maybe ask any pet shop, I'm sure the owner can get you one, just might cost a bit more. Or check every corner of the bird flower market, and ask any pet sellers if they know.

make sure the cage is big enough for it to at least turn its head. something about the cages in china seem way too undersized for every animal i've seen.

Don't buy one from the bird and flower market! Those things are full of diseases and other 'health conditions' and often die within a day or two. some of them are kept in cages that are too small so that they look cuter/younger and therefore can be sold easier. Look for a more mature one from a shop (or a restaurant - not a joke) and you'll likely have less problems. The 'Australian rabbits' grow bigger but tend to be tougher than those dwarf varieties. Some locals call them rou-tu (meat rabbits)!