A cheapo 4-axis game controller would get you pretty close, with the main difference being that you have to hold the throttle where you want it, and the fact that you have a circular range of motion for the sticks, instead of square.
I've flown sims with game controllers before, and it was a decent experience. Not wonderful, but decent.
there is also a new IL2 game, IL-2 Sturmovik Battle of Stalingrad. but not sure how many P38's you'll see in a game focuses on Russians and Germans
for regular flight sim there's always X-Plane, and there's now two new versions of flight sim X. Dovetail will re-release the old version and develop a new. And Lockheed Martin licenses the enginer for their Prepar3D simulator