If you place an order through the DM Modelworks website and use a Post Office Box (and it's your confirmed PayPal address) do not check the "Use PO Box" checkbox. You'll receive a an error page originating from santu.com
I took a quick look at the Santu website as I had not heard of this service. Nice website. However the copyright date shows "2012"
Andy Martin at Aardvark has resin cast the Mudd Coupe. He was selling them on eBay (I purchased one). It needs a Monogram Duesenberg as a donor kit (needs to be modified). The price is/was on par with other high quality resins.
On eBay last night I picked up a mint-in-box, out of production DM '57 Cadillac Eldorado Biarritz convertible. I was the only bidder at $199.99. I thought it was a fair price. Not too much above original issue price. I had one earlier but sold it in a weak moment. I think that I was the only bidder because the seller never once used the word "Eldorado" in the already verbose description. Over & over he kept calling it by the Biarritz name. All in the game I guess.