So I went ahead and bought the $199 offer I received for Sheraton Vistana Villages today! I got a four night, five day stay for $199, plus 15,000 Marriott points. I called and asked if I could get more points, but they said no. I was ok with that though, since it honestly is a really good deal. She also said that there are no blackout dates, so you can travel at any time. There are, however, "red dates" over major holidays and a two week spring break period when an additional $25/night would be charged for nights that are red dates. So worst case scenario, you'd pay $299. However, we have no reason we can't travel during quieter periods, so there should be no reason for us to have to travel on a red date.