I'm interested in building up a decent collection of generic components that I can grab when I want to throw together a quick prototype of a game. I'm not aware of any "component collections" that you can actually buy (I guess there may not be much of a market for them) but if I'm wrong, feel free to link me to one.
I expect then, that what I'm looking for is a game that has good value-for-money for the components since that's all I'm interested in. For that reason, the actual gameplay or rules are irrelevant to me.
As for the components themselves, I expect I'd be looking at a Euro for plentiful generic pieces (more Ameritrash games tend to have components that aren't particularly generic; I'd rather they not be moulded spaceships, or treasure chests or animals or whatever). For instance, I'm looking for lots of cubes in various colours, maybe a few meeples in different colours too. Cards aren't so important to me since they can be easily prototyped from index cards etc. Agricola came to mind when I first thought about it, but that's quite pricey. (But who knows? Maybe the price-per-component value is actually quite good).
I'm aware that prices etc differ in different places, so I'm not looking for a game guaranteed to be available cheaply near me, but I'd be interested to hear how people have solved this problem in the past.
Update: Thanks for the tips guys! The online resources look really good, but are all based in the US and I'm based in the UK! If anyone knows of any online solutions that can cheaply ship to the UK that would be great. The cost of shipping from the US kind of counteracts the cheapness in the first place!