Where to sell 2nd hand Desktop PCs?

Hi, is there any shop where I can sell my desktop pc? or sell the individual computer parts?

They are working btw.

marketplace forum in sgforums

HWZ classifieds

Which is better ah? sell to shop or post at HWZ forums?

And are there shops which buy ?

my friend looking for 2nd hand DDR RAM to use in his old Pentium 1.7GHz...PM me ur selling price if U are selling.

kembangan plaza basement. but i dun find the rates too good lah.