How about a section where only paid members can post, no regular members can reply or hijack your posts. You would be placed in a different category than a regular member. I would place it toward the top of the forum where it will be seen. You can put all your business info, link to website, daily/weekly deals, pictures, etc. Pricing, I'll be very reasonably... A whole year for say $120, thats only $10 a month.
I can even break it down into special categories, like muzzleloading if thats all you sell, or AR15s if thats your specialty, or conceal handgun training classes ...etc

PM me if your interested and I'll get it started.