Walmart offers the Petmaker Fold-able Pet Staircase for $37.52. (Sears charges the same with free in-store pickup.) Choose in-store pickup to dodge the $4.97 shipping fee. That's the lowest price we could find by $5, outside of the mention below. This fold-able pet staircase features a maximum weight capacity of 120 lbs., plastic construction, and carpeted stair treads for better traction.

A close price, Home Depot has it for $38.65 with free in-store pickup.