Dervish and Banges is the only Hogsmeade shop I can recall repairing magical instruments, though I don't remember if Rowling specified wands and I feel as though most people would rather have it repaired by Ollivander, anyway.
To all those who incessantly bring up the "Ollivander's isn't even in Hogsmeade" thing: if J.K. Rowling can accept the idea of a Hogsmeade branch, I'm sure you'll manage. I actually quite like the idea of the parks creating little pieces of canon.
I'm also interested to see how the Diagon Alley Ollivander's will fit into the timeline. Anything before HBP and Ollivander is supposed to be there; it would be kind of lame putting an assistant there. Anything after HBP and the shop's supposed to be closed. We actually never know if it even reopens. Maybe something about it reopening under new management after the war?