Walmart offers the Stamina InStride 360 Degree Bike, model no. 15-0176, for $38.30. (Sears has it for the same price with free in-store pickup.) Opt for in-store pickup to avoid the $4.97 shipping fee. That's a buck under our February mention and the lowest price we could find by $10, excluding the mention below. It features a steel frame, hook and loop straps, and adjustable straps.

A close price: BuyDig via eBay has it for $39.99 with free shipping.