NP, I looked into it but it gets expensive because it is so far and there are few (if any) direct flights so travel is an all day affair. Check out this website and put in some dummy dates to get an idea for yourself Sandy Lane - Luxury Golf and Spa Resort at St James in Barbados
Honestly, if you have not secured any rooms, etc it is not to late to change! Not to discourage you because BELIEVE ME I was SET on Barbados for a long time, until reality set in. If it were just a he and I wedding, I would still do it there!
But my advice: if you want guests to come, I would reconsider a more economical location...