Not sure what purpose you are using it for, but Advatek Pixlite is an LED pixel controller with a DMX out. https://www.advateklights.com/shop/ ~$129
Last USB to DMX box I made was from a $5 FTDI chip. (pros and cons for the DIY DMX route).
Madmapper recommends the showjockey boxes and recently I bought a ADJ Products EZ Kling is an RJ45 to DMX for $100 and it works great.