3mm wetsuit tops needed

I'm looking for some cheap used 3mm wetsuits for my son and I. We have the farmer bottoms. We need the tops or we could use entire suits if they are cheap. They don't need to be pretty just something for Mexico and not moldy. I'm 6'1" 190-200 depending on if it's near Thanksgiving or not and he is 5'7" 150ish.