Amazon has the DeWalt 4-Foot Fiberglass Step Ladder (300lb Capacity; DXL3010) on sale for $69 with free shipping. Weighs 15lbs. Thick rubber tread on all four legs. 

• The Werner FS200 4-ft Fiberglass Ladder is also on sale for $30 at Lowe's. (But only rated for 225lbs)