Did you actually find one for sale? The only one I've ever seen for sale was on eBay a couple years ago.Looked just like the one Charlie has in the picture. The seller was asking something like $3000 for it and it didn't sell. It's such a rarely seen item for sale,I don't know how you could determine what a set market price would be. Seems like it's a case of negotiating between what the seller thinks it's worth and what you're willing to pay. Great idea. I've seen some other peoples home made versions. Not really that hard to make one. I'd like to do one myself sometime!
Metallic blue looks good!