1.) those hybrid parrot fish
2.) $13.99 and up oscars (seen fairly frequently at those high prices)
3.) bettas
4.) nearly all rainbow fish especially at aquarium adventure columbus like $35 each. rediculous
5.) all chain stores "big cichlids" of any species especially dempseys, gt's
6.) medium angel fish - honestly seen as high as $30
7.) all common fish above $15 - such as mixed africans, common plecos
8.) most synos - add in that they usually come in under 1"
9.) discus-The price IMO is right. Plenty of efforts have been done to keep them in tiptop shape. Breeders are your better sources than your local stores.
10.) roseline sharks-These are high in demand and have not been bred in captivity yet. They are also on the edge of endangered status again.