Walmart has returned the budget system for the old folks! It surfs (well, broadband unless you get a modem), it beeps, it has everything but a monitor, modem, or floopy floppy. Lindows OS. (Or put RedHat in it, that's what I would do).

http://www.walmart.com/catalog/product.gsp?product_id=2138699&cat=3951&type=19&de pt=3944&path=0%3A3944%3A3951

17" Monitor for $119.86

http://www.walmart.com/catalog/product.gsp?cat=3951&dept=3944&product_id=2132520& path=0%3A3944%3A3951%3A37802%3A110872%3A37804

$318.86 for a system, not too shabby. Though I think the custom budget system below is much better for you bucks:

Asus Terminator P4SC Barebones (Audio, Video, LAN, 56K, USB, Floppy, 52X CDROM). No AGP slot, though :(

1.7GHz Celeron

20Gig, 7200rpm WD Hard Drive

256MB PC2700

Mouse, Keyboard, Speakers, 17" Monitor

$440 shipped, but not assembled.

Parts from Newegg. You could upgrade the barebone unit for $50 or so, that way you can have better video & an AGP slot to boot.