Nova Tech US via Amazon offers the Nursal Rechargeable Tens Unit with 8 Pads for $35.99. Coupon code "G57SJZSL" cuts the price to $23.99. With free shipping, that's $2 under last week's mention and the lowest price we could find today by $17. It features 16 modes, 20 strength levels, and a built-in timer from 10 to 60 minutes.