philips bt 100! for my girl.
BerlinBoombox for myself.
take a look, guys! awesome sounding machines.
There are plenty of options: Boom 2, Boom 3, Megaboom 3, JBL Charge 4, etc. These speakers are really great at everything. If I were you I’d choose Boom 3 - it’s compact, portable and has great audio performance. Otherwise, take a look at Review Position for comparisons as well, might help! 
I bought a secondhand gen1 Minirig speaker recently and it’s by far the best out of any similar-sized speakers I’ve heard, at least over all the mainstream brands I tried (JBL, Sony, Bose etc). The latest revision has bluetooth as well, if you’re that way inclined.
The Wallet sized Ikea Frekvens
I guess it depends on what your minimum sound quality is.
I am personally fine with using a JBL Go 2 ($30usd).