Harman Audio offers the factory-refurbished JBL 50-watt 4-Channel Car Amplifier
, model no. GTO-504EZ, for $139.99. Coupon code "89GTO504" cuts it to $89
. With free shipping
, that's $10 under our mention from March and the lowest total price we've seen. (It's currently $111 below the best price we could find for a new one.) It features set-up CD, and built-in variable electronic crossovers and variable bass boost. A 1-year Harman Audio warranty applies.