Some capable cheap ones:
eBay - New & used electronics, cars, apparel, collectibles, sporting goods & more at low prices
Compaq Presario SR1830NX AMD Athlon64 3500+ 1GB 200GB DVDRW Tower | eBay
HP Pavillion a210e, AMD Athlon XP 2000+ (1.67GHZ) 512MB, 80GB, CDRW, XP Home | eBay
Yeah not the best, but you can upgrade them *also learning how to*.
The first two you could probably slap in a Athlon x2 3800-4600+ and 3 gigs easy.
eBay - New & used electronics, cars, apparel, collectibles, sporting goods & more at low prices
Compaq Presario SR1830NX AMD Athlon64 3500+ 1GB 200GB DVDRW Tower | eBay
HP Pavillion a210e, AMD Athlon XP 2000+ (1.67GHZ) 512MB, 80GB, CDRW, XP Home | eBay
Yeah not the best, but you can upgrade them *also learning how to*.
The first two you could probably slap in a Athlon x2 3800-4600+ and 3 gigs easy.