That sucks man. But yeah ,Khols wouldn't have have discounted it much for you. As far as the rarity of Superstar rings,this seems to be the case as follows:
RAW (first release-red ropes) very easy. Still all over
Smackdown- Still common and readily available
ECW-Initially very easy to come by. Now much harder at retail
SummerSlam-Packed 1 per case with 2 RAW and 1 SD. So a little harder to find,but still out there in places.
Royal Rumble-Same as above. 1 per case. Still available,but I haven't seen one in a while.
RAW(2nd version-white ropes) This one is 2 per case but is still trickling in slowly in some areas. The red roped version is still predominant.
Others:
Cage Ring-Kmart exclusive. Can still be had in some locations. Getting harder to find though.
Ringside Battle/Extreme Rules- TRU exclusive. Still available
WRESTLEMANIA- TRU exclusive. Still available
Not yet Released:
TLC playset
Elimination Chamber playset
I do not count Flex Force rings as they are IMO ,a seperate lines rings.