For a 500 mhz system that's a good buy.
For what Martoch said about the 133 in the papers I'm not surprised that they sell for $100. I saw in my papers 486s with prices from $75 to $150. Hell, I'll try an ad in the papers for my Cyrix 133 box for $100.
"Nice clean tower with Cyrix 133 cpu, 64 megs memory, cd blaster kit, 2meg video, 56k modem, floppy drive, 1.2gig hard drive."
\o/ Billy