Screen extensions

So I was on Amazon and I was like hey I need a left sided laptop screen because my right side is completely full. I go on expecting to find what I’m looking for but NOPE, they only sell right sided or tripe monitor. And it would cost the same for my to buy a monitor and a stand for it for the same price for a tripe. So before I blow 260 on some triple I won’t use all the way I was wondering what other solutions would work.