for australia...gumtree, ebay, transitions, bike exchange, trading post.
Gumtree, trading post, generally lower end bikes, but you can get lucky and they are free or close to so noting lost but a little time.
transitions, I've never used them, but a friend tells me good things.
ebay, don't know what your bad experience is, I find its more a matter of luck and timing, ie if you try to sell an awesome tri bike just after a season, you'll get nothing, but hold onto until everyone wants to start training for busselton...I've noted this especially with aero gear.
bike exchange isn't bad I don't know how much traffic they pull, but you'll be listed alongside loads of cheaper shops, so second hand bang for buck your bike should look pretty good
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