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Amazon.com has VEVOR Rolling Creeper Garage/Shop Seat, 250 LBS Capacity Padded Rolling Workshop Stool with Tool Tray Storage, Mechanic Stool for Garage, Shop, Auto Repair, Black for $18.54 when you ckip coupon on product page.
Shipping is free with Prime or on $35+ orders.

About:[list][*]Heavy-Duty Steel Frame: Thickened tubular steel construction resists deformation, supports up to 250 lbs (113 kg), with reinforced casters for stable and durable use.[*]360° Smooth Mobility: Equipped with 4 × 2.5″ (6.35 cm) universal casters for easy steering on various surfaces; wear-resistant ball-bearing PP wheels provide smooth movement.