ebay is a treasure trove of odd/grey market car parts. Searching for your car model + "dash kit" will almost always yield a result... especially if your car is a globally-available model.

When searching for a solution for my Saab 9-3, I learned that the level of finish can severely affect the car's price in certain markets due to import taxes and such. In certain markets, cars are delivered from the factory with no stereo. The dealer is expected to install this "option." So, Saab actually has a part number for a DIN kit. I wouldn't be surprised if there was an actual Honda part for fitting a DIN stereo in the Fit/Jazz. It may not be easy to find in the US though...

An odd example of tax dodging is the first-gen Isuzu Troopers. For some years, they were imported to the US as the Trooper II. The only thing different from the Trooper and Trooper II is that the II was imported into the US without a rear seat. Once the dealer installed the rear bench, it was then considered a finished vehicle... assembled in the USA. I'm sure that loophole has been closed by now.