Tom, your choices are buying a $200 bit set for your router and for use in your router table on wood cut on your table saw or a couple of hundred bucks a door, and the numbers can only go up. It is readily accomplished, if you want to throw the dollars at it.
It's also a good way to justify buying a lot of tools that you really want but don't have. The "good news" part of this is that you will end up still saving a lot of money over buying the doors on a good size project.