They rotate through their products and put them on sale different weeks, often 40% off. Ex. would be all studio dies on sale, next sale would be GO dies, etc.. Sign up for their email notices for what is on sale. If you spend a certain $ amt. shipping is free. I have the studio cutter and love the strip dies. For studio dies the groupings of dies go by block sizes, I think this correlates to the GO cubes. I do think these groupings are a good deal, but only if you make a variety of types of quilts. I do love my cutter and dies, but it does take a big gulp to push the buy button and get over the cost.