If you are looking for a turnkey , ready to shoot rifle
Alamo precision usually has a lefty or 2 on their website in the Ready to ship section.
I actually had a rifle on order with them a few months back, but cancelled it. I won't ever have them touch or build me a rifle. There are a few guys on here who will agree. Especially for a lefty build - their proprietary APR hunter stocks are RIGHT handed with a left handed bolt cut. I called them out on it after I bought a stock from them and they acted dumb. Lost all respect from me.