Might be able to pay the developer of the miner for a copy, but I know the current offering dev is trying to get the axiom team to cough up a bounty to make it open source (as opposed to private individual sales). The Axiom "team" however, seems to be quite content in insisting they do everything themselves and any outside work should be done for free and magically leaked to everyone else.

There was an earlier GPU miner that was also offered as "bountyware", which went to limited private sale after the axiom team decided that paying a GPU dev for his time and innovation wasn't worth it. That particular miner is no longer available for purchase. The axiom team has openly asked for someone to leak both of these GPU miners to the public, a move that has really soured their name (for me at least).

Overall, I don't see a bright future for the current axiom coin, their lead developer has gone MIA, missing no less than two deadlines so far, and the entire project is at a standstill.  The algorithm, however, is sound and has a lot to offer in it's current state for both CPU and GPU mining possibilities. I think it is only a matter of time before another coin is made that uses the axiom algo.