Pretty much anything that looks like this
Here’s the one I got specifically.
There’s a lot of “blue cloners” and they all look nearly identical. They’ve got varying quality of hardware, but across the board almost any one should get the job done.
All this is assuming you’re trying to clone a LF tag, of course. A HF tag can be written to with your phone (list of tested models Here), and one of the Proxmark guys can tell you about changing the UID, if it’s possible.