Amazon offers the ASUS Xonar D1 PCI Sound Card for $69.99. This $20 mail-in rebate cuts it to $49.99. With free shipping, it's the lowest total price we could find by $8. It features SPDIF output, Line/Mic input, front audio header, GX 2.0 (EAX 5.0) and more. Deal ends September 30.