Just so people know, Costco sells 24 oz clear plastic cups and lids. They don't carry 32 oz cups, unfortunately, but the 24 oz cups are good for smaller cultures. The 24 oz cups are about $11 for 100, and the lids are $11 for 500.
Use a hole-puncher and punch holes along the side to form a circle of holes. Put a paper towel over the lid of your deli cups and put the lid on. This should give you an impression of the opening on the paper towel. Cut the circle out of the paper towel and clue it to the lid with glue stick. Wah la. Oh clue the paper on the side of the lid not outside.