Recognizing that Jerry Irvine has a history and that I don't really know it, but also trying to assume positive intent. The ad says that the motors are exempt from a variety of regulations.
BATFE: It's sort of reasonable to say that APCP motos are exempt from BATFE rules since the lawsuit. There may be rules that operate in the background for manufacturers that I'm missing, though.
DOT and HMR: This is the one I'm having the most trouble with. My understanding is that the average Joe can't ship rocket motors even if they aren't hazmat. While it's possible that these are LMS-style motors with <30g/grain that wouldn't require hazmat shipping, saying that you're exempt from DOT regs because they're not hazmat is a pretty big stretch. If he's selling to brick-and-mortar stores only, it's not quite as bad since they don't need any particular DOT certifications to sell the motors in their stores as long as they don't mail them.
FAA: It looks reasonable based on the CTI catalog that these could all be <125g of propellant (the 29mm 5G H200 has 260 N-s of impulse and a hair over 125g of propellant). That means that these could fly as Class 1 motors. While it's a stretch to say that means they're exempt from FAA regulations, I can see how one could get there.
NFPA: I don't know enough about NFPA, but I trust
@Steve Shannon's statement that NFPA 1125/1127 applies to all HPR motors. There might be an out if the NFPA rules don't apply specific restrictions on the end user, but that's a long leap.
Club rules: Well, this is the sticking point. NAR and TRA can set their own rules, and exclude non-certified motors sold for profit. That said, there's no reason that the motors couldn't be certified. That would be pretty cheap given that these are F-H motors.
They do ship parcel post, presumably in the <30g propellant category. In the same vein as the LMS motors, couldn't you say that each igniter has <30g propellant so the bundle of 100 doesn't ship hazmat?