All sorts of great makers.
Lakota has super soft leather, but sometimes I like a little more support.
Italia Leather has coupons all the time and their straps are well made and look great, but a little stiff when they are new.
Levy's has some great straps that are available in most stores like GC.
Sully's Straps are fantastic too and offer a lot of customization
https://sullysstraps.com/
-Mike