SWFA (and other optics companies) buy the scopes that the manufacturers use for their displays at trade show and such. They have demos that are sent out for evaluation to writers, too. Some of the items that are returned from end users, warranty returns, etc. Some are new items that may have an upgraded version out now, or coming out soon.
The makers don't like to leave product out on display too long as it gets scratched and dinged up. They want clients seeing stuff that looks new. So every show or two the stuff gets sold off, cheap.
I have bought up entire display booths of merchandise on the last day of SHOT and the stuff is a fraction of the wholesale cost. But you gotta pay cash, and take it all with you, essentially. It can be a logistical nightmare, but very lucrative.
I am always happy to buy something that already has a scratch. Saves me the agony of putting the first one on it.