I'm actually surprised. 2018 seemed to be the year that the Americans noticed the ZX Spectrum. and it's a good thing too, because there is a _VIBRANT_ reproduction market.
You have everything from the Harlequin 128 kits (I have an Issue 3B, which has an RS232 port), to the ZX Omni 128HQ desktop and laptop units, (I have a desktop unit, which I am considering converting into a laptop), which combines a 128K spectrum, with DivMMC for storage, and both kempston and sinclair joystick ports (which are compatible with standard Atari DB9 joysticks), and the ability to switch between multiple ROM types and enabling/disabling the DivMMC from dip switches.
I urge anyone who is a retro-computing enthusiast to seriously check it out, and spend time with them. They really are more than the sum of their parts.
Harlequin 128 kits can be bought from multiple sources
And the Omni 128HQ can be procured from RetroRadionics, who also make a wide variety of cases, and keyboards: