This was a surprise find during spring cleaning! I have no clue when this was published, but it's a cassette audiobook adaptation of "Journey to Sorrow's End" by Pharao Audiobooks, from some time in the 90s? WorldCat lists it is 1995, but it does put a question mark after that date. I couldn't find anything else on google, which I guess makes this a rare find?
It's for sale here. Located in Germany, but as it's very light, worldwide shipping is cheap.