You may not be able to find them right now. Merck, the company that produces the MMR vaccine, stopped producing them in split doses earlier this year. They recently announced that they will begin offering the split MMR again in 2011. (There was no specific date, just 2011). Our pediatrician in East Providence RI, Dr. Robert Griffith of Pediatric Associate, INC., offered the split vaccine and I assume he will offer it again once it's available. He has been great with our delayed/selective vax choices.