Bethesda have announced Fallout Anthology - an almost complete collection of Fallout titles leading up to Fallout 4 (releases November 10) - that's coming to PC on October 2.
The collection offers Fallout, Fallout 2, Fallout Tactics, Fallout 3, and Fallout: New Vegas and all the DLC for the latter two. However, one game (never released on PC, and in all honesty not all that good) - Fallout: Brotherhood of Steel - isn't part of the collection.
The box for Fallout Anthology also has space left for your copy of Fallout 4.