Over the next three days, GOG is discounting their entire EA catalog by 60%. Besides Wing Commander, Ultima and Crusader, their offer includes beloved classics such as Theme Hospital, Theme Park, Dungeon Keeper, Kyrandia and Populous. While you can buy an entire series outright for the sake of convenience, you can also handpick a few individual titles, many for as little as $2.39.
The Wing Commander bundle in particular offers incredible value. All the expansions are included, WC3 comes with a digital copy of the Fleet Action novel, WC4 is the high quality DVD edition, and many games come with the official strategy guides and more. Buy it here, for yourself or as a gift.