Bro,
Samsung service centre for original. For generic, I usually go to this stall opposite the muslim coffeeshop in Toa Payoh Central next to the big tree temple. This uncle there sells all sorts of remotes. Even for SCV boxes.
SIM lim tower first floor....if u can't find it there then tough liao....I got my Toshiba tv replacement remote from there....exactly the same one.....but quite sometimes ago liao....