I agree with APlus Designs; the company we use will provide much lower quantities. Sometimes we do them ourselves, and have gone to either sublimation, print and sew (so you are printing and curing flat pieces, then sewing them up yourself), or we have a dozen pieces of cardboard cut to the size of the koozie that we spray lightly with adhesive and insert into the koozies before printing. Leave them in as you run them through your curing unit (at a higher speed, as others have pointed out -- these will not be getting washed often, if ever). Pull the cardboard out after they are cured (this is where the recommendation of a LIGHT spray of adhesive comes into play).