賣canon機應該去邊賣？

If you want to sell your camera immediately for cash, you can go to second hand shop in TST or MK. But the price will be push down alot.

Also, you can go to some famous camera / photography website in HK. Usually, they have second hand corner for trading between members. The price would be much higher than second hand shop but you need to be patient to wait for buyer's offer.

www.dchome.net
www.dcfever.com

Currently (from the above website), the lens is around HKD2k and the body around HKD3 - 4k
Please note that this is only for your reference and does not mean your's can sell for the same price, it's hard to say how much exactly your set can be sold by just quoting the model number, it would largely depends on the conditions of your equipment, such as shutter count, any scratch, warranty, hong or water good, etc

我上次係星際賣咗部300d...然後trade-in部40d.. 剩body賣咗一干到... 我估你部遟過我果部.. 應該賣到二千掛

30D might not have too much stock left.
BUT你可以試下星際@MK

OR是但去間百老匯叫佢CHECK下STOCK