Im decently close to you OP/shaolin, and could probably get or get you in touch with relatively close people that keep certain breeds, but then craigslist is a decent resource to try (just be sure to put your area code in this format instead of putting totally out, as bots ect will otherwise annoy the heck out of you), as putting your email will give you an endless mess of spam and viruses ect.. if you just want white homers for "dove" release, then i can get you in touch with or get and figure out how to send, as breeder is pretty old school and guessing wouldnt ship, but they are only ten dollars apiece. A competition flier of white racers has them for twenty dollars..
a fancier flier supposedly, are the chinease owls, though i just got mine in fall and havent let them raise squab to try flying yet. if you have hawks already i wouldnt go with rollers, as they are pretty much just targets unless you got good BOP savy birds.
Otherwise I keep flying flights that seem pretty BOP proof and only lost one old bird who was needing to moult or need to have tattered to bare flights and tail plucked, as he had been dragging them constantly to court the hens, then i didnt think and tossed him with the rest, and a large female peragrine scattered them far and wide right before cold bad storms came in, then the BOP came back and the younger ones chased it off as werent caught off guard right after being tossed, that time. good luck in your search, and maybe you can point me in directions also.
Your best bet would probably be homers/racers, flights, or oriental FLYING rollers, or tumblers probly of middle eastern decent (if you want something more acrobatic), if you want something easier to find, widely kept, and known to be decently hawk savy, as hardy easy keepers. im probly forgetting some breeds..