LISTEN TO GIGATRON.
By all means, save up for the Akubra.
The officially licenced hats are crap quality, (the one you're probably looking at is the wool one. Wool tapers at the drop of a...well...hat...)
In general, most of what you'll find cheaper than the Standard Federation is going to be a wool hat. Wool can't easily be re-bashed, (and all the pre-bashed hats, save for Peter Bros, and Steve Delk's Adventurebuilt are incorrect,) shrinks, fades, tapers, and is generally crap.
Save a couple bucks now and replace the hat with another equally craptastic wool knock-off in less than a year, or save up a little and get a hat that will survive 15 kinds of abuse and come out looking BETTER, (not joking. My Fed Deluxe has been dragged in dust, been downrange from automatic weapon fire, fallen off the back of a horse, caught in torrential downpours, blizzards, sat on, knocked off my head by a bullwhip, etc. etc. etc. and it just kept looking BETTER and BETTER.)
You'll be much happier ;-)
All the best.
-Dan