As mentioned stock varies week to week but it also varies from location to location.
My local ollies normally stocks plenty of ships,big rigs, subs, and more recently more and more cars. Normally they have about 5 different kits in stock.
Currently my local one has a ton of 1997 mustang cobra's, 2010's camaro,some old school chevy from the 50's,older vette and another I cant think of right now. Mostly all AMT kits for the cars. Lots of times they also have a bunch of 40's and 50's police cars. Best thing about the car kits, $9.99.
The naval and big rigs I think are lindberg and academy kits, but not %100 as they arent my style.