Also, any pulling exercise with a snatch grip will work the tar out of your upper back. I'll sometimes do snatch grip rack pulls from about knee height to work my back... my entire back.
There's a million chin up variations too. There's several different ways to do barbell rows. Reverse grip, close through wide grip, incline, decline, get some bands and/or chains and there's some more variation there too and that applies to bench press too.
Also, just pausing your reps will add variation too. Boards aren't uber expensive and if you're really frugal and/or strapped for cash you can make them too. Different stimulus from pin presses.
Just use your imagination and you'll have way more exercises to pick from than you actually need.