Walmart offers a pair of Pyle PSi03 Acoustic Studio Monitor Sound Isolation Pads for $15.33. Opt for in-store pickup to drop it to $14.89 and avoid the $5.99 shipping fee. (Amazon charges the same a few cents less.) That's $4 under last month's mention and the lowest price we've seen. (It's the best today by $13.) Each one measures 9" x 12" x 2".