Bigtime, i feel you on that ("feeling like you wasted $13"). But, It just seems like, when you spend your hard earned money on something, you should know what you're purchasing. So in buying a cd, what's the solution? lol
You either:
1) wait and listen to a friends copy,
2) wait until a used cd store gets it, then preview it first. OR...
3) despite that many may frown upon it, you could download it and preview it and If you like it, THEN PURCHASE it. But if not, then DELETE it. lol
But at least, you now have an "informed" way of spending your hard earned dinero!