My kirinite comes from
USA Knife Maker - Knife Making Supplies
I buy everything by the sheet, which is more economical than buying pairs of scales.
In Belgium, I also have to pay import fees, so by the time I get it, there is a 30 to 50% tacked on to the price, depending on which pencil pusher looks at the package.
The bolts are called corby bolts. they're fairly expensive (1.5$ each) but they are very good imo. You can screw everything together, with some epoxy in between, and then grind / sand away the pieces that still stick out. that gives the feel of a continuous handle.
Kirinite is acrylic based, but doesn't smell when grinding and sanding, as opposed to the normal acrylic blanks I used initially. Those stank so bad that you could smell the fumes in the attic after working it in the basement.