I understand the 3 in 30. But how do we see which rewards can only be purchased so many times. MGM Buffet. I have used that one a few times 6 months to over a year ago and tried to purchase one for end of this June. Would not let me. We used Ice House and Excalibur Tournament last week. I know you can purchase a bunch of rewards and only redeem most if them at 3 in 30. I recall others say they have used this many times. Is there a purchase limit to this reward?