Unless you need a lot of polyphony, the best value might be a device that does CV->MIDI conversion in addition to its primary feature set.
I use a Moog Minitaur and a QuNexus. The QuNexus can convert two CV inputs, the Minitaur up to four inputs. The caveat here is that they only accept 0-5v unipolar inputs, so if you have bipolar control voltages (-5v to 5v) or 0-10v you will need an additional converter/scaler to handle that.
You could also look into Teenage Engineering’s Oplab, which is a veritable Swiss (er, Swedish) Army Knife of MIDI and CV conversion. It can cross-convert USB MIDI, DIN MIDI, and CV/Gate in a variety of different configurations, and it has built-in calibration so you won’t have the voltage scaling issues I mentioned above.
There are also a number of options available that just do CV->MIDI conversion, either standalone or in Eurorack, but the first two options above have been working well enough for me.