Least expensive means of loading module ROMs into a 41?

[burkhard]

If you merely want to quickly try out the varied modules, i41CX+ has got to be the cheapest and easiest option.

Once you figure out what you like, though, you really should flash a Clonix of some sort (see Diego's website, http://www.clonix41.org) to put them in a real calculator. Reflashing the Clonix module is pretty easy, but it's not as fast as the screen taps on a phone with i41CX+, so that makes a good sandbox to play around in a little on the train or in a doctor's waiting room.

{Edit: Sylvain's answer came through while I was writing. His writing is better but mirrors my thoughts exactly}