This thread is more than 11 years old ha ha
Yes generally this forum's Marketplace Buy/Sell sections are the best place for deals
However over the last 11 years things have changed too... Clubsnap is STILL the best place to buy/sell 2nd hand cameras, lenses and other accessories
But Carousell has a pretty good selection of photography stuff too ... just not too organized and a little haphazard unless you do keyword searches