MacMall offers the HP 8GB DDR3L-1600 SODIMM Laptop Memory, model no. H6Y77UT#ABA, for $77.99. This $30 mail-in rebate cuts that to $47.99. With free shipping, that's the lowest total price we could find by $42. This 204-pin SoDIMM is low-voltage and features memory speeds of 1600MHz. Rebate ends September 30.