When I got the gig to cowrite the Farscape comic book, I had to track down the DVDs for seasons 2-4 and The Peacekeeper Wars. I only had the old ADV two-episodes-per-box DVDs for the first season, and nothing else.
PKW was easy enough to get, but the others were more of a challenge. Luckily, I was able to find good deals from Amazon Marketplace on all but one, and that one I got off eBay. I paid between $20 and $25 for all of them.
I'm hoping with the webisodes and the comic book, Sony might be interested in getting them back into print.....
What? You mean you weren't provided with a full set of the show? What kind of frelled-up operation are those thoddos running, anyway?