Lafeni via Amazon offers the Lafeni Ab Roller Wheel in Black/White for $22.99. Coupon code "2B32XRIQ" cuts the price to $17.24. With free shipping, that's $6 off and the lowest price we could find. It comes with a resistance band and a knee pad. Deal ends January 30.

Note that Amazon also offers this in a second color, however, the pictured image and the color label do not match, so it's unclear whether you'll receive Black or Red.