Stainless would be about 70.00 each vs. 90.00 a pair for mild steel and powdered.
Oh man, if you make the antenna mounts in stainless I'm in for one for sure. I have a set (L&R) from another place that dosen't make them anymore that I have only had installed since July and they are already all rusty. Stainless just makes more sense IMO because if you are using them for a cb, and they are mild steel with PC, you will have to sand off some of the powder coat anyway to get a proper chassis ground to the antenna. And I'm sure no matter what after that, rust is inevitable. Think about us rust-belters!
Also, dont worry about the bottle opener on the mount. The ones I have on my truck now have them, and I have used them exactly 0 times. If you are gonna be drinking beers, I'm sure you already have an opener around.