From GT Distributors; I’ll post more information once it arrives (in 2-6 weeks; stupid backorders!) and I get it installed.
The E2 P226 grip kit!
This should help the pistol fit my freakishly small hands a bit better (from what I’ve read, anyway), and it’s suposed to be pretty easy to install. It’s also cheaper and less hassle than sending the P226 back to Sig Sauer to get it worked on.