Yes, one way is to go somewhere a band is playing. Ask the band (if you like them).
Another would be to go to a retail musical equipment outlet. Some of them rent gear to bands.
There are several "outlets" where local musicians buy their stuff, be it new sets of strings, effects pedals, drum sticks, new speakers, etc. One of the biggest is
Tom's Music on the Ngurah Rai By-Pass, near Kuta. (I'm
not saying they're "the best".) There are others, smaller but
maybe busier. Talk to any of the staff or put up an ad in their shop. I doubt if you'll have to wait very long for a response.
I personally know a couple of the harder-to-find ones (in Denpasar). Feel free to PM me if you want their addresses.
