Toddscostumes.com is a good beater hat and doesn't look too bad. Fairly affordable.
That being said though, you can't go wrong with Akubra Fed. I own two of them. Pretty spot on for the money and tough as nails.
for a little more money there's also Garrisonhatters.com
Penmanhats.com of course is expensive but beautiful work.
But I would never go with any "officially licensed" product for Indiana Jones as no thought to screen accuracy is ever put into those.....