I don't play on official WoW servers and I got Disco Inferno that is a loot card and holographic. How much is it worth?

Also, I got a Heavy Knothide Leather card... What is that used for? It doesn't have a code on the bottom.

knothide is for crafting. You send in 28 of them (different mats) to get a valuable, pre-determined card.

Disco inferno is worth about $35: http://search.store.yahoo.net/yhst-99140670482918/cgi-bin/nsearch?query=disco+inferno&searchsubmit=Go&vwcatalog=yhst-99140670482918&.autodone=http%3A%2F%2Fwarcraftgamingcenter.com%2F

thanks for the reply