There are four known adult Argie Moondancer variants:
white with pink hair
white with green hair
white with blue hair
white with rainbow hair
From observation over the years, the blue hair variant is the hardest to get. I've only seen maybe 3 or 4 in the last 20 years, and I don't know how many of those are the same one changing hands over and over again. The rainbow one doesn't come up for auction much either and is very sought after. There's a handful of green hair variants out there, and the pink is very common.
There's also a bunch of argie baby Moondancers - can someone help with those variants?