Sure, here's one on eBay for the new style taps. I've seen other ones around but can't find them with a quick search.
http://www.ebay.com/itm/BEST-CO2-CONVERSION-FOR-16-GRAM-TAP-A-DRAFT-Miller-Coors-HOME-DRAFT-DISPENSER-/160879233167?pt=LH_DefaultDomain_0&hash=item257526488f