What's my old axle worth?

Tomorrow I'll be installing a new rear axle with 4.10's,a 31 spline 8.8 Explorer carrier and Moser axle shafts. My question is what do you guys think my stock axle (minus the brake components,ect.) is worth? It has around 4,700 miles on it and it's all stock with 28 spline 3.27 gears. I bet there are some Cobra guys on here who'd like to swap out there IRS for a solid axle, HINT HINT ! If interested, E-mail me. I'm in S.E. Lower MI. Thanks GT JAY