Jog and Shuttle for iTunes?

Anybody know if there is some kind of like USB jog/shuttle wheel controller I can get that works with iTunes? It's so annoying to have to click back and forth on the timeline and constantly overshoot where I'm trying to get to. When I'm feeling generous and do the shownotes for the Daily Source Code I tend to have to re-listen to parts a lot, like when people send in totally unintelligable promos with every effect their audio workstation supports and I have to figure out what the fuck the URL they are saying is after they've applied all kinds of crazy echo and reverb and computer generation and god knows what else.

So seriously...can I get a jog and shuttle wheel controller to fix this issue? It will make my stress level go down a lot. Links please.