I might actually be able to hook you up. Unfortunately with my current finances I can't do it totally free. Not that I intend to make any money, but I would simply need to be reimbursed. This would be cheap.
I work at a TV shop with an owner that like an old horse trader. It's a bit like a junkyard, but we put together nice product and sell it, we also buy unwanted non working TVs etc. Sometimes people do come in with laptops.
Generally we don't really buy working units, but up till now have generally refused laptops with bad displays.
If he were to give like $5 for those that had a sticker saying "made for Windows XP" it would probably suit your needs. Windows 98SE was also installed on alot of PCs in the 400 Mhz range. Other than that it might be hard to tell if it's a 366 or better. Also I assume it needs sound and will need a VGA output at least for initial programming.
I'll do it for free, but money is tight, just what they cost, which will be cheap, and shipping. Ideally ship two or three at the same time.
I'll put the word out.
JURB