Hi Mirelle Anne,
We had the same problem when we started contacting TAs...a bunch of them kept on telling us to contact them 10 months before the wedding and then they could help us.... So we kept on trying other TAs and finally we found one that was willing to contact the RIU and get pre-published prices. I don't see why all TAs can't do this. The two TAs who seemed a little more willing to help were Travel Counselors and Flight Center. We went with TC b/c they were quicker to respond.
As for pricing, we were quoted $1584 + $176 (taxes) for a double room with a garden view for our Toronto guests. I hope this helps Good luck with everything!