Buy.com again has the factory-refurbished HP Pavilion a6518f Athlon 64 X2 2.8GHz Desktop PC for $299.99. With free shipping, it ties our mention from two weeks ago and is among the least expensive dual-core HP desktop PCs we've seen. Features include an AMD Athlon 64 X2 5400+ 2.8GHz dual-core processor, 3GB RAM, 500GB hard drive, dual layer DVD burner with LightScribe, memory card reader, and Windows Vista Home Premium. A 90-day HP warranty applies.