Half Balance Ball Trainer - Core Exercise Equipment for Stability & Strength Training, Includes Resistance Bands & Pump - Balance Beam for Home Gym, Fitness, Rehabilitation & Physical Therapy New-purple is up for auction in Sports & Outdoors. The current bid is $3.50, 94% below the $55.99 MSRP, in Good Condition. This auction has ended — similar items appear in live auctions regularly.