firstly, yes you just need a regular CD player for those, it's pure audio. I don't have a DVD player and am only interested in the radio plays anyway ..

The confusing part is that apparently there is an audio book version too, which I"m not recommending. That's like any other audio book - someone reading aloud. The soul of HGG is either in the radio plays (2 series of 6 25-minute episodes), or in the audio cassettes which came out in the 80s, which I also have and which are even funnier, abbreviated versions of the original 12 episodes, with upgraded sound effects and great spacey music. I don't know if those are still available .

More to the point, I don't know if your Amazon version includes the 12 original episodes, or not. If it does, I'd go for it. If not, the mp3 versions which I linked before definitely do, and I'd recommend those, even if it is an overseas order.