How is getting a discount because you are a member of an organization akin to insider trading?
Most if not all gun retailers provide a bulk and/or police/military discount. It's pretty standard practice. I don't agree with it, but that's the decision of the retailer. I think you are letting your opinion of this group outweigh what is truly right and wrong.
"Timid men prefer the calm of despotism to the tempestuous sea of liberty."
I'm a corporate libertarian!