Hi Woodelf.
I'm in the same position with lots of audio books and comedy on cassette tapes. (I bought a compilation of Martin Jarvis's BBC readings of the "Just William" stories for a quid in a charity shop this afternoon). But, like you, I hadn't got anything really reliable to play them on so, a few weeks ago, I purchased a 'boom box', with a built-in cassette deck and CD player, for £19.97 from Tesco.
I did that after weeks of watching the shelves for a bargain, without success, in the nearest British Heart Foundation Furniture & Electrical store.
Merry Christmas, Terry!
Chris