Man I think for me it would change depending on what I'm shopping at the moment. Right now I'd vote kifaru. First Lite always seems to be on my list as well.
Kenetrek pacs would be awesome. For those of us that live far away some kind of deal where we could try them with no hassle returns if they don't fit. Maybe get 2 sizes and return shipping is covered on the ones that aren't right.
I'm not a marketing guru but I've always liked a bit of a challenge. I don't expect a discount just for breathing. Sell some 1ShotGear branded items. Take a shot in the field and tag 1ShotGear whether it be FBook or IGram get a onetime use discount code. Maybe that's a nightmare?
You really want to do a one time big ticket item do it on optics. Clothing goes on sale all the time. A really great, even one time, discount on some great optics is a no brainer. I would like a Swaro EL range.