Here's "The Deal" when anyone asks the basic question of "Where should I get my sails from?":
1. Website lofts are usually, but not always, less expensive.
2. Local lofts are usually, but not always, more expensive, but for a good reason: the sailmaker can come to your boat and measure and be there, literally, for you if you have questions or need adjustments (which NO online source is going to do for you).
3. It's ONLY LUCK when folks respond with good sail loft experiences, since not everyone reads this forum every day. So the recommendation for somerset sails might be available one day, but if you asked this same question last week or next week, a different skipper would answer with a different loft that he just had a good experience with. That's simple reality. You could do a search on this forum for "new sails" and find hundreds of posts. Really. Give it a try and see.
4. Catalina Yachts has their own in-house sailmaker, I believe it is Ullman, they do very good work, too, and know Catalinas.
Good luck. On this one, as far as a price YOU are willing to live with, you have to do your own homework, since there are dozens of different sailmakers out there. Google searches are your friend.