I use the Oneway "Safe Driver". It's a cup center with a spring loaded point. I believe the cup is 1/2" in diameter, but Oneway is up in Canada so it might be some inscrutable metric measurement that not even God understands. I used a round file (like you'd use to sharpen a chain saw) and put 3 grooves in the cup, giving it a bit more bite. I really like it and never use my 4-prong drive center anymore. It's available from many of the usual suspects. It costs about $40.
If you want something smaller, Craft Supplies sells a 3/8" 4-prong drive center made by Precision Machine for $28. I've not used one, but Precision Machine makes good stuff.