I saw a link to Epsilon Camp
More specifically to our situation, our DS7 is somewhere in the top 0.1% in math, but we're not exactly sure where. We'd want him to be with genuine peers. We homeschool and have one stay at home parent (and the other often working at home too) so we certainly don't need "summer camp as child care now that school's out" at all. Also we both have math PhDs and could probably teach DS7 anything he'd see at Epsilon Camp (and maybe the "older camps").
To take MathPath as an example... Your future 11yo could be learning from John Conway and Robin Hartshorne each summer. You're talking about some of the best research mathemticians in their fields... and getting to hang out with other kids like him. Both of these are HUGE benefits if you can afford it.
Now Epsilon is a similar unique experience... but for our DS7 the value proposition isn't as clear. The social benefits are more muted at a younger age. The faculty is very strong but I feel like we can meet his intellectual needs on our own. Though I am researching geometry texts to go with Euclid in the next year or so. Its a hard call... You could always call or email and get their thoughts. A former director and former professor from Epsilon post on the WTM accelerated boards so you could also look at some old threads there and ask for input.
Good Luck.
ETA. Also my impression is most kids are 9 or 10. Some of the strongest kids may be younger, but either way it sounds like you have some time to figure it out.
