They are just a couple dollars on robosource.com
I use them and they work great.
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Btw, this is the link you want.
Edit: 
revived old topic.
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does anyone know how I should go about drilling a hole in a 60 tooth low strength gear for screw jointing?
I think my favorite by far is the keps nut, stays in place, but not way too hard to unscrew. Though I wouldnât recommend using them for wheels. One time we got a random Omni wheel and when we were taking the bot apart, we discovered some a**hole decided to put a bunch of them on the wheels for some reason. I forget how tho.
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