I don't know of any site that lists positions and pay rate. Part timers start at $8.50 and are usually put to unloading trailers. Some go straight to scanning/labeling and never have to do any grunt work.
You can always apply. If you don't like the looks of it or feel the starting pay is too low (which it is) you can always pass it up.
It's the pay raises and insurance the keeps many of us there. Takes a few years to get to decent pay rate but by then you have a couple weeks vacation and probably a better position which would pay a dollar more per hour.