Both volumes of DARK SHADOWS: BLOODLUST are now available for pre-order on Amazon. Volume 1 is set for release tomorrow, Jan. 31, with Volume 2 scheduled for release on Feb. 28. If you haven't heard it yet (Big Finish has been releasing MP3 episodes online for the last few weeks) you're missing out. I'd caution against wandering into online discussions about the series until hearing it for yourself, because the cliffhangers and plot twists are part of the fun.
If you want to own the physical CD collections, Amazon appears to have the best prices. Even better, if you order both sets as a bundle, you can get all 7 discs for just $37.16.