Cricut cart storage - 12x12 paper tub about 6 inches deep with the manuals in the bottom. There is a clear insert piece made to fit inside the tub that holds the carts and keypads.
Stampin' Up! stamp set storage - 13in wide tubs purchased at The Container Store on clearance for about $5 each. Hope I don't need more soon! My stamp sets are sorted alphabetically.
Paper storage - I bought the white rack from the store in Conway when they shut down. I got the black one from Hobby Lobby. Both work just fine, but I actually want to move the paper into the same bins that I have my stamp sets in. It will be easier to look through.