Note that Netrunner is a "living card game" (LCG). You can buy the base game and play with just that to start, but to really have fun with it you're going to need expansions and build new decks. These add up and they keep adding new ones. It's not as bad as a collectible card game (the difference here is that the packs for Netrunner are a known quantity - they aren't random), but it still gets expensive.
It is pretty cool how it works, but I didn't want to keep buying expansion packs so I gave up on it.