Someone in my area has luck finding these things. They are mostly store displays at TRU and Target from what I have seen to entice folks to buy Lego's(like any of us need that trick!) They are not cheap by any means. He purchased a TRU display with the Star Destroyer and Jabba's sail barge in it for near $1,000.00!! from an ex employee who got a hold of it and a set like the one seen with the AOTC slave 1 has to be expensive!
I've purchased a couple different TRU displays and while I don't have the one pictured the MOSt I have paid for one is $200. I was able to pick up the last SW display from TRU with the Venator for $85. You should be able to pick that display up for $100 or so as mentioned.