Yeah, lots of us use Gumtree on occasion - some check it multiple times daily. You just have to know what you are looking for and how to evaluate it. Also beware of scammers on Gumtree (we have two threads here about GT - one for
good deals, one
for scams.
We have the
classifieds here on GFSA too. Has the advantage of being able to see member profiles and, once you've been here a bit, you get to know the regulars.
Another good source to keep an eye on is
SA Music Store on Facebook. Also a lot of regulars.