It would be more authentic to get the +3 but, it's just easier and cheaper to get an emulator and the +3 disk images.
I can remember when Boots at the local town high street had the Spectrum 48k, 48k+, QL, 128k, 128k+, 128k +2 all on the same shelf.
The Commodore 64 was round the corner all on it's own.