Newegg offers the Klipsch 10" Reference Series Front-Firing 300-watt Subwoofer, model no. K-100SW, for $149.99. This $20 mail-in rebate cuts it to $129.99. With free shipping, that's the lowest total price we could find by $44, although it was $20 less on Black Friday. It features a frequency response of 32Hz to 120Hz and a 300-watt peak power. Rebate expires June 13.