Are there small sized condoms?

My parents are Veitnamese, but i was born in america. I'm sure you all know that asians have really small penises. Well, me and my girlfriend r going to have sex but i cant find any small sized condoms. I've tried the medium ones and they just fall right off. I called wal-mart about this and they thought it was a prank call. :( That kinda made me feel bad for some reason. but yeah, do you know any store taht sells small sized condoms! thanks!