I just got some 16oz and 20oz plastic cups and covers at the Restaurant Depot for when I make iced coffee at home to go and they are very flimsy. In the past, I've looked elsewhere and haven't seen them. I'd like to get them a bit sturdier like the ones from Dunks or Starbucks. If they aren't available, I'm going to approach the manager at a Dunks or Starbucks to see if they'll sell me some. Suggestions? Thanks.