I find the Numrich site hard to navigate, so I just use their schematics if necessary. For parts, I use Brownell's, Midway, Natchez and some others depending on what I need.
“If ye love wealth better than liberty, the tranquility of servitude better than the animating contest of freedom, go home from us in peace. We ask not your counsels or arms. Crouch down and lick the hands which feed you. May your chains set lightly upon you, and may posterity forget that ye were our countrymen.” ― Samuel Adams