I just got my brother in-law a set of JIS drivers, got them through Amazon I think it was like $25-$30 for a set of 4. I'll probably order a set soon too for myself.
A most thoughtful gift, Gwardy!
For his birthday, give him an IMPACT DRIVER!
Snap-on impact driver shown with four JIS bits. A Harbor Freight impact driver, with bits, will cost around $ 5; the Snap-on tool shown is 50 years old. Today, the Snap-on would cost around $ 50, I imagine.