Dell Small Business has the PowerEdge 600SC 2.4GHz Pentium 4 Server for $270 w/ free shipping after $100 rebate. It has 40GB 7200RPM HD, 128MB DDR, 48x CDRom. No AGP slot.

Go to Dell Small Business.
Click on "Choose PowerEdge SC Server" under the PowerEdge Server column.
Click on "Customize it" under the Entry Level Value column.
Select the following options:
Upgrade to a PowerEdge 600SC, Intel P4, 2.4GHz533Mhz FSB, at a 1.8 celeron
1Yr Parts + Onsite Labor (Next Business Day) + 1Yr Technical Support [subtract $348.00]
Standard Windows Keyboard, Gray
Logitec System Mouse, Gray
Continue to add to cart. Price should be $389 after automatic $110 discount.
Apply coupon code 8D2755970FD4 for another 5% off.
Send in the $100 rebate.
Final price is $389 - 5% - $100 rebate = $270 w/ free shipping.