mini usb is basically extinct in my house. But now I’ve got the same conundrum with micro and usb-c. Oh what I wouldn’t give for one connector to rule them all.
There are still new devices being sold with Mini-USB sockets, e.g. the handheld audio recorders by Zoom. (They plug into USB to function as external sound cards.)
I've been using 2-in-1 Micro/USB-C cables found on AliExpress for about a year now and have been giving them out to all my friends as gifts. Haven't heard of any going bad yet. The ones I picked have "leashes" so that the USB-C cap doesn't get lost.