There are a few places you can look around for 2nd hand clubs.
1) Far East Shopping Centre - There are at least 8-10 golf shops on the 2nd level that you can browse around in
2) Creative Golf in Chinatown - http://www.creativegolf.net/
He specializes in buying and selling 2nd hand clubs, a good variety of clubs to choose from but... not necessarily with the lowest price around
3) Forum's Market Place - tons of members selling and buying their clubs with photos for you to select from
Though lefty clubs are abit hard to find but I am sure you can find a good number from the above. If you have a coach, ask him to recommend you the right clubs to buy, if not, generally beginners will go for cavity back, thick sole and offset clubs.
Hope it helps...