I think of those places because that's where we got our letters of recommendation for DYS - we also had the situation where the teacher 'just didn't see anything unusual.' Chess clubs, Math circle, game nights, aviation clubs, 4H, or any other fun activity are also likely sources of letter-writers. Some familys end up hiring a Math mentor. Some of the parents of your daughter's friends who get her giftedness might also be willing to sit with your son for a few minutes, teach him what math they know, and then write a letter.
Smiles,
Grinity
Ahhh, I'd understood it needed to be a more formal relationship. I've got parents of friends who see it handily. You just have to shut up the background noise of a classroom, wait for a response, and listen & parse his response.
