I have been a custom shirt shopper for many years. I like to wear shirts untucked, and being 5'5, it is impossible to find shirts that fit (my shape is non standard too)
After getting terrible to good shirts from a few places, I found Nattyshirts.com. Far and away the cheapest and fastest shipping of any custom shirt place ive found. Between $30 and $40 a shirt. Free shipping when you buy 3 shirts. When you buy 5, you get one free and they send you a trial shirt to get fit right. Took me a bunch of back and forth to get the fit right, but finally got it perfect. Shipping is about a week from Pakistan. They barely speak english but they are very helpful and responsive.
Only downside is most of there shirts are terribly ugly - but they add designs pretty regularly. I have found about 10-12 that I like. Plain white is ok. I also find they are much better as casual shirts, vs suit and tie/shabbos shirts.
I have no connection to them, just wanted to share for those in the market. My closet is full of their shirts.