They are up for sale on GOG right now and tomorrow they will be discontinued.
GOG = good old games that sold videogames that were no longer supported and sold by the company that made them.
Why GoG? Because once you bought it and download it, the game is yours, forever.
You can burn it on a CD, keep it on a USB, share it with friends, install it on multiple computers.
They are obviously discontinueing it with the remaster of them by Blizzard, but they will keep up support for the games once you bought them.