The classic pulley and ascender method of hauling still has its place if you are on a budget or need to haul really heavy loads. Just about any pulley and ascender will work but we are reviewing a combo of the Petzl Ascension with the CMI RP 101 so that there can be a comparison with other hauling devices in the review (see best in class for hauling devices). The Petzl is the most popular ascender and the CMI is one of the more popular large pulleys under $30. There are a lot of other pulleys out there like the Mad Rock 1" Micro Pulley. Just make sure it has a sheathe bigger than 1.5 inches and doesn't weigh more than 8 ounces.
We almost never use the pulley and ascender method and instead use a Pro Traxion for loads over 80 pounds and a Mini Traxion for loads under 80 pounds. But if you are just starting to wall climb and want to stagger your purchases, you can borrow a pulley from a friend or buy the Mad Rock 1-inch Micro Pulley for a mere $12. Save the hauling device purchase for once you fully commit to becoming a wall addict. Or, if you are hauling loads bigger that 200 pounds, the big CMI pulley will make life a lot easier. Once you do want to climb a lot of walls, I would get the Petzl Pro Traxion or Petzl Mini Traxion depending on how heavy your loads are.