I dunno, I'm seeing completely listing prices on individual bits, just not everything. With Defence of Hoth, the anti-vehicle turret seems to go for between $50-$65 and the figures seem to go for $20 a pop- just can't find any loose listings for the whole set.
With Attack on Hoth, the figures seem to go again for about $20 a pop, while I can only find the AT-ST legs listed.
So I dunno, maybe prices have shifted a bit in the past few months, who knows?