Never been a fan of livebearers as you quickly become over run with fry that you need to seek homes for, go for the betta and give a poor fish a new lease of life..
I believe www.aquabid.com is a good place to look for every tail type imaginable, as well as wild caughts. If you post in the betta section, they can give you more ideas, there are also quite a few breeders in there as well.