Muscle brakes run from $115 for the mini, & less than $150 for the big one. Add about $100 for a local smith to thread, & install, or pay upwards of $60 for shipping one way UPS.
If all you want is a brake, a reputable local smith can install most any brake you choose. I think Ross brakes are less $, but have no idea how effective they are in comparison. Hered good things tho.
Kirby's Painkiller brakes, & Jim's Muscle brakes, seem to be very highly regarded on here (LRH).
I think Shawn makes a D.E. brake too if I'm not mistaken, but I may be mistaken. Check out LRH's sponsors. They're all great guys, with top notch products.
I'm having the Muscle brake installed on my 300WSM build.