Ebay offers Sharper Image 1017213 Powerboost Deep Tissue Percussion Massager Version 3.0 for $16.56 (reg. $69.98) free shipping with Amazon Prime. 

Product Description:
Sharper Image 1017213 Powerboost Deep Tissue Percussion Massager Version 3.0, Massage Gun w/ 5 Attachments, 6 Speed Settings

• Ergonomic oval, rubber-gripped handle for improved performance
• Up to 4.5 hours of uninterrupted usage
• USB-C charging cable included