Hi! Well we sure have some similarities, I got married at LC and my family is Italian, Mexican, and Puerto Rican...among other things. Funny.
Anyway, I brought most of my stuff with me and it wasn't too much of a pain but there are a lot of deals in PV on things depending what you want.
Check out the flea market and booths along the Rio Cuale downtown. Also there is a flea market adjacent to the marina that has some really cheap things. There are always the beach vendors but you'll get better deals at a flea market.
If you're buying bulk you can make some killer deals there. Our flowers were through LC too, but I didn't get them for my bm's, just me and MOH to save where we can. I will say they were beautiful though!!! I have pics if you like )