I love using Medjool dates in bliss balls because they're sweet and help bind. But sometimes it's not worth buying whole dates if you're just going to pulverize them. Check out Ziyad baking dates, which are considerably cheaper and ready to use.  Baking dates are much more dense, so you can't go cup for cup. I find that a 2:1 ratio (whole dates : baking dates) usually works. So, if a recipe calls for 2 cups whole, pitted dates, you can sub in 1 cup baking dates.