I just purchased Arcana for the SNES from their site. They are a legit site, that is if you want to pay for the extra shipping. Arcana was in good condition, as it wasn't being sold "as is" like the games here are.
Stuff like this is more or less common practice in the business world. It's not like Nintendo is the only company that's ever done something like this. That doesn't mean it's right, but it's how things go sometimes.
But the coupon code still works. I played and got 10% off, and I went to EBgames.com and the code worked. Although it is rather pointless since there are already other better codes and it can't be combined with the others.