Buying sails on line or from a local shop

I am looking to purchase a new main sail for my 26 ft trailer sailor on a budget. I found a place online that will sell me a new darcon main sail with 3 reefing points for the low price of $747 plus shipping. Seems like a deal to me except for the fact that I don't know anything about buying sails. My other option is to go to one of the limited sail makers in the Buffalo NY area and hope I can afford what they offer or possibly buy used. Wondering if anyone has any experience with buying on line or even specifically buying from Precision sail loft. If anyone from my local area has experience with a local shop I would love to hear about it. Buying anything online scares the hell out of me. I also always buy local if I can afford to.