Just keep your eyes on:
https://www.thebeachcats.com/classif...-for-sale.html, also the
parts & boats classifieds section on that site or perhaps join some relevant fb groups to try to track down used..
Any
sailmaker will make you a sail, if you want specific recommendations you'd have to post your budget/range, intended usage, etc.
There are always tradeoffs, 'normal' bigger boats I'd lean towards a smaller/local
sailmaker when possible, but beachcats (& production multi's) you're probably better going with a sailmaker who has specific experience w/ that model nacra.
Glasser, performance
sails (nacra north america or
east coast sailboats), Slo, elliot pattison, Whirlwind, Doyle, calvert, Shurr, - all make great beach cat sails