True people passing off repros on ebay is out of hand and disgusting what they go for, no argument there.
I was tipped off last year by one of the large repro makers to a paper house online with a particular type of sticker paper they have that works to make a solid label of the later era kind for the SNES stuff which bleeds into the cheapo ones the GBC, GBA and N64 have too. If you want to seal it, the best so far would be buying clear packing tape from a spot like Office Depot and layering it over the print out before cutting it.
I wasn't kidding when I said I know a way, but I just don't want to get stuck with a minimum order of like a 100 sheets. I've got 2 games, technically 3 I'd have done up and that's it and that could all fit to one sheet given no screw ups. A key thing is when you get the paper you get a laser printer blend made for that kind, not the cheap crap for home user deskjet type paper and then take it to an office depot or like store and have them use the appropriate printer.
Now I don't know what it would cost to have a local store print it, perhaps a couple bucks? The pack of 100 sheets would be around $40. You do the math, I think you could probably do a label for $5 plus shipping?