tast The basic and commonly used ones are these, there aren't many others that are suitable. Take a look at the DM32, 6900DMR, and 878 – see which one is best for you.
Besides, with DMR, there's really no point in looking for something even cheaper. If your budget is limited, you might want to consider the 6900DMR.
For dm32, you can check out the Bilibili reviews.
Also, if you absolutely insist on verifying the DMR, then you need to verify both the DM32 and the 6900DMR. I don't know about any other models.
If that doesn't work for you, and if it's cost-effective, you can make them yourself. Then, take your design drawings to a local testing facility to get them certified, and you'll be able to obtain the license.