I don't know if you are still looking for info or not, but I am in Calgary and getting married in Punta Cana in May.
We are getting married in Calgary before to save money. We are having the ceremony at Majestic Colonial on may 12, 2010. There are about 10 of us going for 2 weeks and the 20 coming for 1 week. The prices from Alberta were 1500, plus taxes, and connector flights. So just under 2k (that price includes flight, connector, taxes, and the rooms at a 5 star all inclusive) It was only an extra 500 per person to go for another week so a few of us decided to go that way.
We used weddingsbyoceans as our travel agent. Although, their business is in Ontario, they are excellent! The are very good with their follow up and always return my calls or emails the very same day.
PM me if you want more details and stuff....
Good luck!