Ending today, Altatac via eBay offers the refurbished 5-lb. Apple MacBook Intel Core 2 Duo 2GHz 13.3" Laptop in White for $174.95. Apply coupon code "PSUMMER20" and check out with PayPal to drop the price to $139.96. With free shipping, that's the $31 under our mention from September and the lowest price we've seen for this model. (It's also the best deal we could find for a refurb today by $20.) It features an Intel Core 2 Duo 2GHz dual-core processor, 13.3" 1280x800 LCD, 2GB RAM, 120GB hard drive, iSight webcam, Gigabit Ethernet, AirPort Extreme (802.11n wireless), Bluetooth 2.1+EDR, 6-cell battery, and Mac OS X 10.5 Leopard.

Note: A 90-day warranty applies, but it's unclear who backs it. Additionally, this coupon can only be used once per PayPal account within a single transaction.