You can find some good deals on computers at this forum.
http://www.fatwallet.com/forums/categories.cfm?catid=18
A couple of systems I bought from Dell.
PowerEdge 600SC,2.4GHz/512K Cache,P4,533MHZ Bus, includes floppy drive
128MB DDR, SDRAM,1X128 DIMM
Standard Windows Keyboard,Gray
No Monitor Option
40GB 7.2K RPM IDE Hard Drive
No Operating System for Dell PowerEdge Servers
OTHER
Logitec System Mouse,Gray
On board Network Adapter
48X Black,Compact Disk Drive for Dell PowerEdge
Hard Drive Configuration #1, MotherBoard IDE,for PowerEdge
600SC, 533Mhz FSB, When Ordering With 1 or 2 HDS
Type 3 Contract - Next Business Day Parts and Labor
On-Site Response, Initial Year
No Warranty, Year 2 and 3
On-Site Installation Declined
Ship. and/or Handling $0.00
Subtotal $369.55
Taxable: $369.55 Tax: $29.11
Total $398.66
VISA $398.66
Mail-In Rebate - $100.00
Total 298.66
Dimension 4550 Series,Intel Pentium 4 Processor at 2.53GHz
128MB DDR SDRAM at 333MHz EA 0.00 0.00
Dell Quiet Key Keyboard
FREE UPGRADE!E772,17IN(16.0IN VIS)MONITOR,Midnight Grey
32MB ATI RAGE ULTRA 4X AGP Video
30GB Ultra ATA/100 Hard Drive 7200RPM
3.5in Floppy Drive
Microsoft Windows XP Home Edition,English
Dell Application Back-up CD, Factory Install
Dell Support 2.0 for Dimension 4550
Dell 2-button Scroll Mouse
Intel Pro 100M Integrated PCI NIC Card
No modem requested for Dell Dimension
40X/10X/40X CD-RW Drive
Integrated ADI 1885 Audio
No Speaker Requested
MS Worksuite 2002,CD with Documentation,OEM,US,English
Type 3 Contract - Next Business Day Parts and Labor
On-Site Response, Initial Year
No Warranty, Year 2 and 3
Ship. and/or Handling $0.00
Subtotal $609.00
Taxable: $609.00 Tax: $47.98
Total $656.98