a guitar player friend has two Hartke 410XL cabs and needs advice on pricing them. He's a guitar player and I've been playing through Edens for years, so we both don't know anything about the prices for used Hartkes. The cabs are in average to good condition. they might be 4 to 5+ years old and seem to work fine. Anyone with experience in selling used Hartkes out there? what's the high / low sale price for one of these cabs?