Pelican is not the only game in town...
I keep my Armalite AR10 in one of those long pelican cases.. Its a very expensive case and is very high quality.
When I bought my Rem870 slug gun, I wanted a new case for it but was kind of turned off by the pelican due to the high cost.
After doing about three days of research, reading amazon reviews on different cases, and watching youtube videos on them, I found one of these on ebay:
http://www.nrastore.com/gear/gun-cases/nra-all-weather-double-long-gun-case
I paid $79 for it brand new from some guy who had "more than 10 available".. whatever that means.
First, its not a Pelican.. but I have to say it is almost just as good. If I had to quantify it, I would say it is about 80%-90% just as good as a pelican. Which, for anyone who owns a pelican knows, that's still a darn good case.
I should note that my Pelican and my NRA case are almost identical in size.. The pelican plastic walls are bit thicker but not by much. The pelican has a stronger snap action when you lock it close.. The NRA case has six latches but the one located at the end with the case handle is a pain because the handle is in the way of large hands.. its a minor complaint and would not have stopped me from buying it.
If you have a $3000 gun and you're worried about a truck running over it during a hurricane, I would get the pelican.. but if all you're worried about is a good quality level of protection that rises above most others, I'd say the NRA case is a darn good deal.