Basically if someone wants to borrow them I'm cool, but I would do the same thing as checker.. You pay me what they cost and as long as they return in like condition I give the cash back. I have 2 of them and a few different size heads, I can get you what size blades you want for what they cost me. You will need a couple blades per 33" tire.
Looks like you can get them for about $70 with 1 head and your about $15 per extra head. Worth buying if you want to grove your tires, I misplaced mine and bought a second. They work really good, I don't know how much better the $350 ones are but for how good they work I wouldn't spend the extra money.