Behringer MPA40BT-PRO a look at the cheaper battery powered speaker in the range.

Prices on the versatile MPA40BT are very affordable especially if you find a good second hand unit. Battery replacement is easy and they use less expensive types compared to the MPA 100 and 200 models, around $20-$25 for a new one. It comes with a fairly weak mic system the ULM 100, so maybe use a standard handheld mic with an XVIVE U3 , or handheld mic and cable. Also has 2 x Combo inputs, RCA and Bluetooth. The Pro model has wheels and extendable handle. This one is about 5 years old seen plenty of abuse and works well and still sounds good.