Geeks.com offers the Intel SR1435VP2 Xeon 3.0GHz 2GB 250GB Server w/VID LAN - B for $449.99
Specs:
-Intel SE7320VP2 Dual Xeon Server Motherboard
-Intel Xeon 3.0 GHz Processor 
-2 GB DDR RAM 
-250 GB SATA hard drive
-ATI Rage XL integrated video with 8 MB SDRAM
-Dual 10/100/1000 Network interface controllers (Intel 82541PI and Marvel 88E8050)

Geeks.com offers the Dual Xeon 2.4GHz 1GB 120GB 1U Server w/VID for $349.99
Features: 
-No Operating System 
-1U Server
-Dual Xeon 2.4 GHz processor(s)
-1 GB RAM
-120 GB IDE hard drive
-Gigabyte 8IPXDREL-GG Server Board
-350 Watt power supply

Dell.com offers the PowerEdge T105 server for $249 + $20 shipping!
Specs:
- Dual Core AMD Opteron 1210 1.8GHz,2X1MB Cache
- 512MB DDR2, 800MHz, 1X512MB, Single Ranked DIMMs
- 80GB 7.2K RPM SATA 3Gbps 3.5-in Cabled Hard Drive
- On-Board Single Gigabit Network Adapter
- CD/DVD Drive 16X SATA DVD Drive
- 1Yr Basic Hardware Warranty Repair (5x10 HW-Only, 5x10 NBD Onsite)

How to get it:
 1. Click here
 2. Select the following:
     2.1. 512MB DDR2, 800MHz, 1X512MB, Single Ranked DIMMs add $0
     2.2. 16X SATA DVD Drive add $0

Geeks.com offers the Intel Xeon 3GHz 2U Rackmount Server for $509.99
MFG Part #: SR1435VP2 
Server include: 
-Intel Xeon 3GHz processor
-2GB RAM
-250GB hard drive
-ATI Rage XL integrated video with 8 MB SDRAM
-Gigabit Ethernet

Dell PowerEdge 2650 Dual Xeon 2.8GHz 4GB 5x 73GB 2U 2003 COA - 1,429.99