I personally feel the price of any carded figure comes down to supply and demand.
There have been numerous Luke Gunners, Luke Bespins, Leia original trilogos available this year and therefore the price has dipped. However one of these may not show up for another 6 months or so and therefore the next one to come up will sell for significantly more.
The last ERG was about 6 weeks ago but was on ebay USA and graded 80 or 85, seller only shipped to US, I think it was on a BIN and went for $450 or thereabouts