Newegg offers the iBUYPOWER Arc Series Intel Core i5 3.5GHz Desktop PC, model no. NE781K, for $599.99. Apply coupon code "VCOJAN25" and pay with Visa Checkout to cut the price to $574.99. With free shipping, that's $275 off and the lowest total price we could find. Features include an Intel Core i5 4690K 3.5GHz quad-core processor, 8GB RAM, 1TB hard drive with 120GB SSD, AMD Radeon R7 250X 1 GB graphics, DVD burner, 802.11ac wireless, and Windows 8.1 64-bit. Deal ends January 26.
Note that the coupon can only be used once per account.