At $150, you are going to have a much easier time looking into a futon instead. Tge great thing about futons is that you can find a frame on FB for dirt cheap, and buy your own mattress for under $100. More on reddit.com

First off, I get your first time living by alone, but in reality it’s insane to say you will find a couch for $80, not what you have above. Second, I’m not downing anyone on buying used furniture, but it’s one of those items I stand on that I wil not ever purchase used. Clothes you can sanitize in the washer, but a couch, who knows what secrets the foam under his hiding. And yes, I stay in hotels and sit on other couches, but your home couch is just that, inside your home. You’re gonna lay, have your face in it, etc. Here is a brand new couch for $149 https://www.ikea.com/us/en/p/glostad-loveseat-knisa-dark-gray-70489011/ This one can double as a Futon $139 https://a.co/d/4HCd8Pg More on reddit.com

I don't think its a good idea buying used upholstered furniture with bedbugs being a real issue, so that takes out thrift stores and possibly from people's homes, etc. Ikea has a wide variety of sleeper sofas but there is a 'trick' of them being in stock. More on reddit.com

I found a good one at Macys for a reasonable price years back. More on reddit.com