Usually $5–10 for both games. Worth it.
But for purists and retro enthusiasts, not all versions of the game are created equal. If you are searching for the phrase you aren’t just looking for any old shareware disc. You are looking for the definitive, polished, bug-fixed, complete experience. You want the "Apogee" version—the 1.4 release that represents the final, official update to the original DOS engine. wolfenstein 3d 1.4 full version download
Buy the GOG version. It’s cheap, you get v1.4 full + Spear of Destiny, and you can extract the raw data files for ECWolf in 5 minutes. No viruses, no guilt. Usually $5–10 for both games