I added the mid level dining plan well after our 180 day mark and this was also on my must try list. I signed up for the touring plan reservation finder and was able to snag one that way. I also checked
MDE multiple times a day. Just be aware that even if you click on the link they text you within seconds of it being sent you may not get it. I was getting frustrated because it seemed no matter how quickly I signed in after getting an alert it was already gone, but then suddenly it worked so keep trying. Also, if you get an alert and don't get it make sure you go back on the site and refresh the search because once they find one they stop searching.