Walmart offers the Louisville Ladder 4-Foot Fiberglass Step Ladder for $45.40. To drop the price to $36.94, opt for in-store pickup. (Amazon has it for the same.) That's the lowest price we could find by $15. It features slip-resistant rubber feet and a 225-lb. weight capacity.
Update: It's now out of stock at Walmart; however, Amazon still offers it for $36.94 with free shipping.