Blinq offers the refurbished Buffalo MediaStation 8x Portable DVD Burner, model no. DVSM-PC58U2VB, for $18.49. Coupon code "BUFFALO20SD" drops it to $14.79. With free shipping, that's $10 below our May mention of a new unit and the lowest total price we've seen for this burner. (It's also $10 under the best price for a new unit today.) It burns DVD media at 8x and CD-R media at 24x.
A 90-day warranty applies, although it's unclear who supports it.