The limited edition Official Serenity Blueprints from QMx have sold out from the company's website. According to company spokesman Andy Gore it was "Definitely, our most successful product to date!"
You can still pick up a set of the 10 18"x24" full-color prints of incredibly detailed floor plans and cutaway scenes from every aspect and angle of our favorite ship, but now you'll have to hunt for them. TFAW.com has some in stock, and KM Collectibles, and you can always try eBay.
Many thanks to QMx for a truly spectacular prop. Designed by Geoff Mandel (graphic artist for the movie) and Tim Earls (illustrator for the show and set decorator for the movie), this is the most accurate set of blueprints you will ever see. No detail has been overlooked and more than a few questions get answered (like where do they go to the bathroom, anyway?). The prints are on heavy bond paper and look fantastic on a wall. Any wall. Every wall!
You can read an interview with Geoff and QMx guy Andy Gore here.