?perco Perco Counterfeit Money Detector Pen (5 Pack) - Easy to Use and Reliable Universal Currency Fake Bill Checker for Personal & Commercial Use - Ensures Authenticity & Prevents Fraud is up for auction in Office Products. The current bid is $0.25, 97% below the $9.95 MSRP, in New/Like New condition. This auction has ended — similar items appear in live auctions regularly.