As one of its daily deals, Best Buy offers the Pioneer 12" Component Subwoofer, model no. TS-W304R, for $29.99 with free 2-day shipping. That's $10 under our mention from two weeks ago and the lowest total price we've seen. (It's the best deal today by $16.) It features a 4-ohm impedance, 20Hz to 220Hz frequency response, and 95dB sensitivity; it handles up to 300 watts RMS (1,300 watts peak). Deal ends today.