I was needing a server for a client and my mothers business and notice that Dell has the Poweredge T110 II for $449 with $200 off instantly. I thought it was a great deal. Bump it to an i3 for even better processor for $58.
I started scrolling down the page to see if I could remove anything to make it cheaper, and noticed the Mouse / keyboard and 17in monitor was only a $12.29 addon.
So in conclusion, Dell Poweredge T110 Core i3-2120, 2gb ram, 500gb SATA, mouse / keyboard and 17in LCD for $352 shipped.
Coupon is 1KMK5Z5NQGVCTX expires 5/2 or with a max of 400 uses.
It would make a good starting NAS at home with Windows/Unraid or even a good Plex server if you don't want transcoding, or just pick up the fastest Xeon proc off ebay that will fit in it and upgrade it to transcode with no issues.
Should of included a link to the server