The DLC content are all downloaded easily via the PlayStation Store; adding the God of War: Ascension Ultimate DLC Bundle will save time in putting all 30 + individual items on the shopping cart and checking out.
While the NTRQ ROM is available to download for free — runs in an emulator or original hardware via flashcart — Mute City is also selling NTRQ NES carts (with the developer's permission) for $ 40.