Lenovo Thinkpad X240 12.5″ Intel Core i5 4300U 1.90GHz 4GB RAM 320GB HDD

This particular thinkpad currently sells for about $200 and with a few upgrades makes for a nice computer. You can upgrade the ram to 8GB and toss an SSD drive in to replace the much slower HDD and you’ve got a very nice computer for about $300.00. You might want to consider adding a new battery too