I can guarantee you no one made much of a profit on these units. I know what dealers and distributors pay… and it is more than $299. Reference the conversation with Reeds in the other post about these units at the show. The guy at Reeds said anyone selling LX5’s for $299 would have to be crazy.
Or it would have to be a promo where profit was not the goal. 
This was a promotional deal that you’re not likely to ever see again. I’m sure they were sold at MarCum’s cost as a promotion for this event.
As for the normal retail… with every item sold at retail you’re going to see markups from manufacturer to distributor and from distributor to retailer and retailer to consumer.
My guess is the guys that landed one of these units… they thought the pricing was dang cool. 