I'm looking for a used laptop to put linux mint on.
Any suggestions?

Dell, HP, or Lenovo.
4 - 8 GB RAM.
Decent display.
at most 250 GB storage.
less than $200.

This would be best in it's own thread, but look into ThinkPad T430's. Solid laptops that can be had cheap and are extremely linux-friendly.
If you can find them, then for something a bit newer, and much lighter and thinner, the Latitude E7440/E7450 can sometimes be found for those prices.

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I recently got a thinkpad x250 for 200EUR, which is a bit more than 200USD. Otherwise it fills your requirements I believe.

It's hard work, trawling amazon, ebay & local variants for just the right thing, but it pays.
Asking questions about it here won't make it easier.

Many of the members of my LUG are fans of Thinkpads.

I've had good luck with a couple o Dell Inspirons in the past. The only catch is that they had Broadcom wireless, which takes a couple of extra steps to get working.

Any of those three with at least a Core2Duo and capacity of 4GB RAM (I favor Dell, also), though BIOS may need updating to the latest.

Using a Latitude D630 now, with 4GB RAM and 120 GB SSD, running antiX 19.1 64bit

^ Latitudes were high on my list, too, when I was searching for a small, affordable, but fairly recent laptop.

Just bought my third Thinkpad and I am very happy with it. I am just about to install Linux on it (you can see, I am now temporarily using Windows).

If you buy a Thinkpad, you'll probably be OK. You can always check the Ubuntu hardware list and look for compatability.

When buying a used laptop, make sure the battery is OK and if not, check to see whether you can replace it.

Also I recommend replacing any hard drives with a SSD and getting some extra RAM. However the former is the most important to get some nice performance on the cheap!