As one of its daily deals, Amazon offers its Prime members the Perfect Ab-Carver Pro for $24.99 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs around $10.) That's tied with our mention from a year ago and the lowest total price we could find by $11. This ab wheel features carbon steel spring coils that add resistance on the way out and assistance on the way back. Deal ends today.