What fish would be easily sellible to pet stores and through classifieds?

Koi. People with ponds, and there are more and more of them all the time, and who don't know what they're doing, generally "re-stock" their ponds at least once a year. Plus, a really good-looking koi is almost like an addiction - koi fanciers have a hard time turning one down!! Plus, they are relatively easy to breed and care for, and even the ugly "mud fish" looking ones can go for $6-$10 when they're only a few months old (around 4" or so). A perfect doitsu or kinrin tancho (platinum scaleless or diamond scaled, with a red spot on the head) can go for $100 or more, depending on the size....What fish would be easily sellible to pet stores and through classifieds?
Livebearers maybe?



Some livebearers are: guppies, platies, mollies, and swordtails.



But most petstores only buy from certified fish breeders and fish farms.
Pet stores buy them through distributors. Most people aren't going to look for fish in the classifieds.What fish would be easily sellible to pet stores and through classifieds?
pet stores wont buy fish from youWhat fish would be easily sellible to pet stores and through classifieds?
A one year old Chinese Hi Fin Banded Shark. These are almost impossible to come by and are very expensive.