Make your prusiks from 5/16" nylon braid or stiff 3-stranded nylon. Do
not use webbing material, it slips.
You might try Intermountain Sports (or maybe its Inner Mountain sports)
as they seem to be the latest caver supply place. The place to buy
cave stuff used to be Bob & Bob but I have no idea if they still exist.
You could sew your own, I did and it has been in and out of the deepest
pits in the world under gawdawful conditions. Use one of those sewing
awl things with a bobbin in it (Brand Name is "The Speedy Stitcher").
BE CAREFUL and dont be a dead macho moron.