Speaker for music classroom

I’m a middle school orchestra/general music teacher and looking for a bluetooth speaker to use in my classroom. I need it to have good sound quality and be loud enough to be heard when 60 string students are playing along with it. I’d love something that is portable either on wheels or light weight enough to easily carry (I’m 5’2 petite woman). I’d like it to be under $150 if possible but could go up to $200 if needed. Bonus I’d could use it as an amp too. Thanks in advanced!