BetterBasics via Amazon offers the MeasuPro Tens Unit for $26.99. Coupon code "TENSELEC" cuts it to $21.59. With free shipping, that's tied with our February mention and the best deal we could find by $9. It features three stimulation modes and four electrodes. Deal ends May 24.

Update: The price has dropped to $24.99 before coupon, $19.99 after.