Fantastic DVD here, and at a great price. You can also find an even more budget-conscious version, but there will be fewer extras.
Opinions on this film vary. Die-hard Cronenberg fans sometimes find eXistenZ to be a little lightweight. Especially when compared to more provocative films like Crash or depressing films like Spider or Dead Ringers.
On the other end of the spectrum, those unfamiliar with Cronenberg's work may find this movie to be too bizarre!
I won't talk too much about the plot, as other reviewers are better at it than I am, but I'll say that it's kind of a game within a game within a game (within a game?). Like a few other films of the day it explores the nature of reality (The Matrix of course is most popular).
eXistenZ was actually Cronenberg's biggest budget at 25 million (not including his current project A History of Violence). The special effects are fantastic, and there are some good moments of gore. A couple people get shot in and around the face. Yes, this is a return to his past in many ways, though again, in a slightly more playful manner.
There's plenty of extras on the DVD, most notably three separate commentaries and a long (almost an hour, I think) feature about production designer Carol Spier which mostly focuses on eXistenZ but also touches on some of her earlier work with Cronenberg.
Definitely worth getting, and an especially good introduction to Cronenberg's work (before moving on to more disturbing pictures like Videodrome and The Brood, and more slow, paced pictures such as Spider and Crash).