Despite the nostalgia of the rubber keyboarded version I decided to go for this one as I'm planning to use it extensively and wanted a quality keyboard: https://manuferhi.com/p/n-go-full-include-wifi-rpi-zero

The nostalgia option would have been from this site: https://ultimatemister.com/product-category/zx-spectrum/

Both are great from all reviews and the keyboard on the one I ordered is rated better than on the actual ZX Spectrum Next although not as stylish.