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Second-hand, all of pic related for 15 maplebucks (original retail was about ten times that). From a store, probably the big Mega Halo Banished AA turret set from Walmart for $19 on deep clearance, was originally $99 (TRU had it at $109).
As a bonus, some years ago I needed cash and threw up a few extras on ebay from my starship collection, among them a pair of loose Mon Cal cruisers from the Titanium Series, paid about 6 bucks each originally. For reasons unknown a bidding war ensued over them and the winner ended up paying over a hundred bucks. Never understood why and the asking prices on ebay have only gotten crazier for them, still have one but I'm hanging on to it.