If you are looking for a desktop computer, I came across this deal at DealNews:
Lenovo offers its Lenovo K450e Intel Haswell Core i5 3.2GHz Desktop (no monitor), model no. 57328801, for $579. Coupon code “K350E8801” cuts it to$539. With free shipping, that’s $260 off list and the lowest total price we could find. Features include an Intel Haswell Core i5-4460 3.2GHz quad-core processor, 8GB RAM, 1TB 7200rpm hard drive, DVD burner, 802.11n wireless, and Windows 8.1 64-bit. Deal ends September 3.