Living in Germany, with its fundamental tradition of engineering, I have dozens of perfect and inexpensive sources at hand. They sell in Europe and some overseas too. But for small quantities transport is important and you should buy parts from local sources.
I try to buy form German producers, if possible. But for some parts, China is the only source that I can afford (especially for the RAMPS-kit).

But I'm thinking about switching from RAMPS to other hardware (e.g.TI), because even chinese RAMPS became quite expensive, relative to its part-costs. Like with filament Chinese producers and resellers know they can earn extra profits with RepRap and 3D-printing.

The one thing that makes me mad is the filament price. How can it be, that filament prices don't fall, but rise instead, while the raw material is more than 15 times cheaper?
Will build me own extruder though and buy pellets (for which there are some interesting sources here in Germany too).