Depending on what side you need, finding an axle can be a bit of a pain. The green cup on my driver side got all boogered up because I didn't realize that my inner CV boot had torn. I found a few aftermarket sources for the passenger side axle (which is the shorter of the two), but I couldn't find a driver side one. As far as I know our front axles are unique to the VX so a Trooper or Rodeo axle won't work, but you may want to call Merlin to verify that.
I ended up finding an axle out of a salvage yard VX and had it shipped to me as a spare. The shop that I took my VX to to work on the CV joint ended up taking the axle out of my VX and sent it off to a machine shop that welded up all of the scars that were in the inner race and then machined everything back to original specifications. It ended up being fairly inexpensive to have my existing green cup welded and machined and it's been in the VX now for a few years without any problems (and that's with two or three trips to Moab too).
One word of caution; when/if you drop your front axle, or work on the half shafts, or really just get near the front spindles at all, be VERY careful not to damage the ABS/speed sensors because they are ridiculously expensive (ask me how I know
).
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong, it usually turns out to be impossible to get at or repair."
-Douglas Adams, Mostly Harmless