Jerry is an excellent source, no doubt, but there is a lot of information online now. Jerry brought them to this country, but many breeders have further developed them. I'm not discounting Jerry at all, only saying read anything and everything you can. Not just one source.
Start as high as you want and let people make offers. But do your homework on serama genetics. Even the best birds can have "not so great" offspring, and pet quality seramas can produce some beautiful offspring. So if you want to grow them out to judge them for yourself, you may get more...