Has anyone tried to get a spare CD cartridge for a Mk2 GS300. I have not asked the Lexus dealer because I assume it will cost an arm and a leg from them.

I bought one for my MK1 GS300 from Lexus Twickenham - I think it cost around £35

You could try getting a normal Pie on ear one. The one from my old pioneer changer I have in my Honda is identical (except it says pioneer). Try Seme They stock most bits and parts for electrical things. Because I had to reject my first GS300 I somehow ended up with two caddies. I'd let you have one, but it's pretty convenient on long journeys to have two.

Its not too bad from the dealer. I got one for the MK1 GS for £32 and then managed to cross ref to a sharp item which peeved me a bit. Check out dedicated ICE suppliers and they will probably get you a cheap alternative