It could be sort of an unauthorized dealer thing, or an existing dealer dumping overstock under a fake name. Doubtful they are counterfeit, that'd be pretty difficult to pull off I suppose!
Musicians Friend isn't always as cheap as you might think either.
So it could be several things. A brand like Audio Technica could be found at huge discounts at times because of blow out deals they'll have on one particular mic or two.
War