Amazon offers the Acer Aspire TC-780-UR11 Intel Kaby Lake Core i7 3.6GHz Desktop PC for $579.99 with free shipping. That's the lowest price we could find by $7, although most retailers charge $645 or more. It features an Intel Core i7-7700 Kaby Lake 3.6GHz quad-core processor, 8GB RAM, 1TB 7200 rpm hard drive, and Windows 10 Home 64-bit. Deal ends May 8.