Animation and visual effects-types are probably familiar with The Gnomon Workshop. Their training DVDs cover all manner topics in the film, effects and game creation worlds, with discs by industry professionals covering topics like matte painting, character design, 3D modeling and sculpture.
I've wanted to get my hands on some of these fro a long time. I even feel a desire to get the ones that teach things I'd never use; like tattooing. The downside is the cost. Each disc runs $60-80.
Since these things are so unbelievably expensive I'm constantly scanning eBay to find people unloading their copies on the cheap, which there are plenty, usually going for about half the original price. I recently picked two discs for $50 that would've cost me $110 new, both coming from a guy selling about 70 discs in a two hour period.
In fact there's often someone selling a bulk lot of 100 or more. I can't fathom spending the 10+ thousand dollars it would've taken to acquire that stack of DVDs. For that money you could've gone to college and learned some of this stuff.