District 9 - not much, many are satisfied with the german release which is almost identical and can be had for very cheap even right now. currently 12-14 euros on amazon.it
TDK FS - not much, it got rereleased again in Canada and about a month or so ago the FS one showed up at axel and people who did miss out on it got it then. Currently like $22 on amazon.ca
John Rambo - rerelease - perhaps $60-80
Avatar with book - not much, with the rerelease extended steelies out there most would want that more than the bare bones uk version.
Indy still sells well, which surprises me, but you could probably get $75-100
Iron Man FS would be your best seller, if its new sealed and absolutely perfect - anywhere from 125-200 on ebay. If you got great feedback there, maybe $250 if at the right time.
If it has any imperfections 100-175
my opinions ....