Our local Ace Hardware stores have that sort of thing, though it's been too long to recall how cheap.
Also seems like I saw some on the wall at the local lawn mower/small engine shop when I was getting the reel mower sharpened...
Swamp coolers
My local bearing shop sells this kind of stuff - useful when you're trying to assemble an air compressor out of disparate stuff. But not cheap. I'd be looking at MMC, in large part because their catalog rocks.
+1 on ace hardware our local one has all kinds of pulleys belts, gears, chain, bearings, and shafts. The next place i would try would be your local industrial supply or tractor supply house
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