I have occasionally looked at the Topps Gallery of Champions metal cards on eBay over the years but never purchased one. I purchased the sterling silver version on eBay recently and it arrived today. Nice heavy oddball card. Still the aluminum version and I think there's a bronze version as well.
On a side note, Metallattorney's #1 card on his Top 10 Favourites list taunts me each time I check his blog to see what new Sandy cards he's acquired.