Where Do You Go When You Need Cables?

I know in the mobile tech world one of the big attractions and big keys to achieving Zen in a Mobile Tech lifestyle is becoming un-tethered and cable-lite. But we still need more cables than I think any of us what like to admit or carry with us. So, where to you go when you need to pick up that cable? The local big-box? Radio Shack? On-line? Well, via Zatz Not Funny, I discovered this link to MonoPrice.com this morning. They seem to have some great prices on that extra USB cable, as well as quite a few other accessories. Anyone else got a good source with good prices for these kind of mobile tech purchases?