Madison Sporting Goods via eBay offers the Mongoose Men's 26" Beast Fat Tire Bike in Red for $194.99. Apply coupon code "P20MEMDAY" and check out with PayPal to cut the price to $155.99. With free shipping, that's the lowest price we could find by $43. It features 4.25" knobby tires and a cruiser frame. Deal ends May 29.

Note: This coupon can only be used once per PayPal account within a single transaction.