For those using 5% Betadine as a single-use prep, how are you handling the associated costs or aliquoting?  

Very difficult legal question. Other countries make 5 or 10 cc bottles produced by Allergan and other generics for 1 dollar. They are multi-use and sterile. Not legal to import into the USA. By FDA law, for patient use, 10 percent has been used in the USA for 20 years without a significant problem....