Quoting Mandy Schlatterer:" How much do they range? Is it weird to buy used?"
Not werid to buy used. Price depends what diapers you want. Pre-folds are cheapest, but do take some time to get use to and require covers. Fitteds are next in line easier then pre-folds just snap on baby plus a cover. All-in-ones, hybrids, and all-in-twos are usually most expensive but also more convenient as there are no covers needed. Just put on baby like disposable diaper.
We started out with pre-folds with our oldest but husband hated them so we went with fitteds then one-size (one-size diapers fit from infant to potty training). We did get a handful of all-in-ones. With this baby we started right away with newborn fitteds, and will go to one-size after she doesn't fit in newborn anymore. We also have six covers, three per kid.
One has to add in cost of wetbag, and cloth diaper safe detergent too. We have two wetbags. Big one for home, small for going out. We use soap nuts for detergent, which is pretty cheap lol.