There are some really cheap ones (eg the Moen MO-VB) but I don’t think they’re proper univibes. The TC one is specifically an imitation of the original Shin-ei univibe (though I’m assuming it’s digital) as is the MXR (which I’m fairly sure is analogue).
Dunlop also do a Hendrix-branded univibe, I’m not sure if it’s the same as the MXR one or tweaked in some way.
There are some really cheap ones (eg the Moen MO-VB) but I don’t think they’re proper univibes. The TC one is specifically an imitation of the original Shin-ei univibe (though I’m assuming it’s digital) as is the MXR (which I’m fairly sure is analogue).
Dunlop also do a Hendrix-branded univibe, I’m not sure if it’s the same as the MXR one or tweaked in some way.