Send us your measurements, we'll get someone in China to build your sail. If it doesn't fit...?
Maybe it's your fault for measuring incorrectly, maybe they'll send it back to China for corrections, maybe...
Speak to your local sail makers.
My sail maker is about 10 miles away. We have a coffee, swap war stories, I get excellent service, I've dropped an urgent repair in at 1800 and picked it up at 1200 the following day, and he feeds his family.
Richard lives in Hong Kong and the sails are made in Shenzen in China. Typically 10-20% cheaper than a UK loft on mainsails because of the higher labour content, less on foresails. No reason why they should not be OK if you want a standard sail and are OK with your own measurements. Usually has good winter offers.
If you want to make some savings you can get a similar service from Kemps on line service e-sails.com
I've just received a new Genoa from them. Absolutely delighted with it. Excellent quality, price and communications. Highly recommend. Payment via credit card and Paypal. Quoted price includes import duty and shipping.