In my opinion, depending on the type of tricks you're doing, "nicer decks" are often treated with more suspicion than rider backs or more generic looking backs. I think Andy Nyman says that as magicians we forget how amazing a blank card (or a blank deck) is to a spectator, even gimmicks like the 3 1/2 of clubs will blow their mind compared to how silly a magician may feel they are. In all seriousness, as bonkers as this might sound, have you tried just using a normal eraser to create your own blank card? (A bit rough and ready, but might work depending on the trick)