Looks like it's best to get them now, as a quick search of the bigger retailers indicates these have Royal Guards have sold out. I think every OT trooper that has been sold out for a period of time has spiked up in price. I just found a good deal on a second Snowtrooper Commander this past week. It's not the HT prototype but it's not bad. And I have given up hope that there will ever be another made.
And here I was thinking I was the only one looking for a second Snowtrooper Commander. It's a got a few issues but overall it's a quite nice figure. I swapped out the hands (too bulky) and bought an extra HT chestplate for mine (SSC chest is a bit flat) but the figure just didn't deserve the flak it got. He is a bit tall but then the HT Snowies are like 1/4" too short, have stubby legs and cheapo Hasbro-type boots.
But yeah to be fair, I got my Commander for $130 shipped (estate sale or something) and my guards were TA parts plus one complete boxed figure - I ended up getting them for under $150 each shipped all up, mostly because it's a figure that only really needs the helmet, hands, shirt, cape and pike for neutral "guard" display (though I did get a set of boots loose, but I do worry about pleather deterioration on those.)