TomTop offers this Abdominal Muscle Trainer for $9.99. Apply coupon code "WDMT" to drop it to $8.99. With free shipping, that's $4 under our January mention, $11 off list, and the lowest price we could find. It features 6 work modes and 10 levels of intensity. Deal ends November 30.
Note: This item ships from China and may take four to six weeks to ship.
You very likely are putting your laptop battery into an early grave.