I thought this was eye-popping to find. If you haven’t yet built an exocar to find drop pods scattered around planets, finding Drop Pod navigation co-ordinate data is the next best thing. They’re used with the signal booster.
Make sure to check Trading Posts when you arrive on a planet or the Space Station Terminals or Minor Settlements. They may or may not have Drop Pods for sale. Goodness knows where I found this. It was in a galaxy far from Euclid so no much use generally to those starting the game. But I’m sure similar finds exist in Euclid.
If I had found this when starting a new game save mode, I’d have purchased the whole lot to unlock the slots as soon as I could. Ah well that’s life!