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Parts-Express.com has Dayton Audio 120W 12" Powered Subwoofer (SUB-1200) on sale for $ 139.99 – $ 10 with coupon code "cjten" = $ 129.99. Shipping is free.
Not as great as some deals years ago, but it hasn’t gone for this price recently and it is a solid sub for the price if you are looking for a budget sub. Note it is physically pretty large.
Top choice on https://thewirecutter.c
I have one if you have any questions. Just noticed the sale trying to point a friend to get one for himself.