Be careful. Most pet rat groups OR pet rat breeders will not accept or want your rats. I'm very active in the rat world, especially in Florida. I know the Australian Rat Forum is very open to all kinds of breeders. Don't bother with any USA forums, and not sure about UK forums. The only people really willing to pay "good money" for a rat is a breeder, and that's only if that rat has a long, well documented pedigree. You could probably get a backyard breeder to buy from you, so I would go that route.
Also, you will more than likely get flammed in most communities for being a dreaded "feeder breeder", and then word will spread FAST. So be very choosy when picking out a forum and when to introduce yourself.
Rat breeders with a name will not care if your rats can fly and talk, if you breed them for food and do not document linage... and when they disprove, the majority of their group will also.The rat world can suck with how clique-y it is. Good luck.