I got a whole set at Lowe's pretty cheap.
GETTING them, and actually being able to get the bolts OUT with them, are entirely different propositions though.
Of the 30 bolts I've TRIED to remove with them on joysticks, only about 20 came out.
The rest all had to be removed with a "Screw-Out" from Sears.
Once you DO get them out, I highly recommend replacing them with standard bolts.
They are 10X32, IIRC.
I replaced all of mine with some nice brass bolts from Home Depot.
The brass is not as shiny as the stainless ones, so it doesn't draw as much attention to itself.