What media works in Sony DVD separate

Quite by chance I bought some Datasafe 24x media off of Ebay. It turned out that it worked well in my stand alone Sony DVD player ( for Audio or VCD ).

My stock is almost gone & I’m searching for more, I’ve learnt that this media, made by Princo, is no longer available, I’ve tried numerous brands, all of which come up “No Disk” when in the player. The exception being rewritable, which works. Does anybody know of any working media, available in the UK.

John