Where can I get an used cat carrier to bring a stray cat to shelter?

The shelter have pet carrier boxes that you could buy for a few bucks. You might want to call them first to make sure.

They have traps you can get but i dont think you can bring strays in there without paying or you have to take them to greenville you better call them I know you can take them in a trap to animal allies and they will fix ot then you can release it back out because thats what the shelter does if they pick up strays they Catch then have fixed then release So You really need to call them

Try offer up, let go, or Craigslist

Have you ever went to a flea market they have some there that's good there also the offer up app you can download in Google play they have them too