Sweety Life via Amazon offers the Sweetylife Knee Pillow for Back Pain in White for $19. Coupon code "DL4UA2L5" cuts the price to $13.30. With free shipping for Prime members, that's $2 under our mention from three days ago and the lowest price we could find by around $15. It is made with memory foam, features a contoured design, and a breathable, zippered cover. Deal ends January 31.