Unopened would be a fair bit rarer, though. I still have my gold cart edition, complete in the box, but the box has... definitely seen better days.A quick look on eBay.ca only shows five auctions for gold carts available at the moment, and only one of those is complete -- although the seller is a bit of an idiot, thinking he can get 990 euros for it.
The rest just have the cart, and are averaging around $40.
Not sure what's up on eBay.com, since I never go there... get disappointed too much when I find out they don't ship to Canada.