It would appear that Uniden has been using 24-ohm speakers in numerous scanner models for some time now. I googled "24 ohm speaker" and saw a few old threads on other forums about blown 24-ohm speakers in older Uniden models. Although I have never opened it, my 246T looks like it has the same size speaker (from the outside), I would assume it is the same 24-ohm model inside. Maybe you can find a non-working "parts" scanner on eBay real cheap and take the speaker out of that (of course there would be no guarantee that that speaker would be any good either).
Another option you could try is a speaker with a higher impedance. A higher impedance speaker will reduce the output, but won't overload the internal amplifier circuit. Here is a 32-ohm 0.8" speaker for only 50¢ a piece. (no power handling specs listed). At slightly less than 1" in diameter it should fit ok and even has a self stick ring around it. While probably not the best solution it may work ok as a temporary fix.
Good luck
Another option you could try is a speaker with a higher impedance. A higher impedance speaker will reduce the output, but won't overload the internal amplifier circuit. Here is a 32-ohm 0.8" speaker for only 50¢ a piece. (no power handling specs listed). At slightly less than 1" in diameter it should fit ok and even has a self stick ring around it. While probably not the best solution it may work ok as a temporary fix.
Good luck
