Sure, there are lots.

Buy a kit, build your own, e.g. a Harlequin.

http://www.breakintoprogram.co.uk/computers/building-a-harle...

Or an improved clone, e.g. a Sizif 512.

https://github.com/UzixLS/zx-sizif-512

Run it in an FPGA, such as an N-Go.

https://manuferhi.com/c/n-go

Buy an improved clone. For me the best is the Spectrum Next. I own one.

https://www.specnext.com/

Or, buy an Arm/Linux based clone that is highly compatible and has better graphics. This is the easiest and maybe cheapest.

https://retrogames.biz/products/thespectrum/