Try the library, the local comic book selling store that hosts trading card games, any music program, the local-most museum, and the chess club. Join the state gifted association and attend some programs.
Try joining TAGMAX
TAGMAX - home educating gifted and talented children. To subscribe, send a message with "subscribe tagmax firstname lastname" in the body to listserv@listserv.icors.org
Ask around on TAGMAX if anyone knows 'what's the deal' locally. Once you find one homeschooling family with peers for your kid, you'll probably find a whole cluster.
Remember that one of the main reasons that folks homeschool in the first place is so that their child's advanced academic needs can be met in a natural and comfortable environment, without the need for labeling the child or singling them out - so you may be surrounded by homeschoolers who think that their child is working 3 grades above age level because of the wonderful benefits of homeschooling who would look blankly at you if you use the G-word.
In the long run, remember that your DS's strongest scores put him a whole standard deviation above the gifted cut off - so kids who are exactly peers will be rare. But more findably gifted kids who are a bit older might provide wonderful peerness.
Best Wishes,
Grinity
