Amazon has 36" Omega 91900 Plastic Creeper for $25.71. Shipping is free w/ Prime or on $25+ or $35+ orders (minimum requirement varies by location).
Product Description from Store
- LIGHWEIGHT – One piece blow molded creeper that made out of HDPE plastic, light weight but strong. With its impact resistant, it gives an users extra comfort while laying on it.Fit Type: Universal Fit
- 300 LBS CAPACITY – It features 300 Lbs. capacity with the length of 36 inches and the width of 16 inches. It fits comfortably for most users
- SWIVEL CASTERS – Features 6 multi-terrain swivel casters, which are industrial strength with oil, chemical, and grease resistant. With caster size of 3", it provides with the extra maneuverability
- ERGONOMICS DESIGN – Sit slowly on the end of the creeper and lay back to rest your head on the padded headrest to offer extra relief. Two molded-in tool trays offer ease of working while laying down