Dell Small Business has the Dell Dimension 2350 2.2GHz system with 256MB RAM, a 40GB hard drive, CD-ROM and network card for $500, with a 15" Dell LCD monitor. Shipping is free through today, but tax might be added where applicable. Click featured systems under the 2350 on the side to find the bundle.

http://www.dell.com/us/en/bsd/products/series_dimen_desktops.htm