The local lofts that are working with these factories don't charge prices that are $2.3k over RT, at least in my experience. I do agree with you that North Sails is expensive, but I think that they are about the highest priced option.
I've had two sails order through a small loft in Seattle. The first one was made by them, but the second one was imported and made by China Sail Factory. I just was buying a third sail (working jib) and priced it there, at Island Planet Sails (who also uses CSF), National Sail, and a few others. The pricing was within $100 in all cases. However working with the local loft gets the the advantage of having them measure the boat and to provide after sale service if necessary.
Island Planet did give me two quotes, one was for a sail delivered 6 months out. That one was the cheapest option of all quotes by far.
Here are some raw numbers from the quotes that I can find:
* Island Planet now: $1396
* Island Planet March: $1085
* local Loft built by CSF: $1450
* local Loft built in Seattle: $2037
* Mack Sails (built in FL, order online): $1592
* Rolly Tasker: about $1350 (seem to have deleted the email from them)
All prices are without taxes or shipping. That adds $50-$150. I also got quotes from a few other places, but they all ended up in this rough price range.
I ended up buying a "never used" second hand custom sail on eBay that had the correct dimensions for a working jib on my boat and which was made about an hour away by Halsey Lidgard. That one was $750. The fabric was a little heavier (8.5oz) than I wanted, but should help it last longer as a heavy weather jib. I'll be flying it tomorrow (in sub freezing temps...brr!) to verify shape and fit before knowing for sure if I did the right thing. I can verify from condition as delivered that it does look new, I don't think it has ever been installed on a furler.
For my dollars it has been worth buying local on new sails. I'll probably be buying a new mainsail sometime in the next few years and it will almost certainly be from one of the lofts operating near my marina.