Harn products are not cheap, even in PDF.
That being said, the Harn Region Map went free in PDF earlier this year for "a limited time only." How long is that limited time? Your guess is as good as mine.
I was a fan of Harn back when it first released in my early days of gaming, and probably bought the Harn setting back in 84 or 85. You could literally spend a fortune getting everything that is released for it, but the free map shows you the attention to detail that is part and parcel of the setting.