Besides the Manta and Company deal, the money-spenders deal was about 4-5 years ago by Games Workshop.
They posted a BUY A CHAPTER deal. I'm not shitting you at all.
A whole chapter of marines, as depicted on the inside cover of the old marine codex, was for sale right when GW started putting out the major space marine plastics. It even came with 2 thunderhawk gunships, and I don't mean the current ones. I mean the ones with 150+ peices that had to be warped into correct shapes and fitted with your own plasticard in spots, and cost a whopping 625 bucks a pop.
The deal was thousands of dollars, and everyone at my FLGS used to die laughing just looking at it and wondering was rich kid was getting one, or which GW employee was sacrificing his future with his discount on one.
The WHOLE chapter from the codex picture. Just look at it..