I have several of the Legacy ones, some have fallen and snapped joints over time. I also have an Endor one with major standing issues, so I might have to try out the lock washer trick, though the weights for the feet sound like an interesting alternative.
As for the new one, I ought one at full price at Walmart when they first got them in. Eventually I picked up 2 more of these at Ross for $22.99, and got 2 more in from BBTS recently. Hope to eventually find a spot for them in dioramas.