If u want cheap ones,
better do it online. If u want to buy in Singapore, of course it is cheaper than that in China, U can go to Chinatown( a shop selling camp stuffs, u have to tell them u want to buy tactic knives, then they will show u.) or u can go to peninsular plaza in city hall.
make sure u get a licence when u get the knife.
BTW, u know how to choose knives?
Or do u know some basic knowledge about knives?

Girls should not touch that kind of stuff.

Don't show that in public place, it's illegal in Singapore.

When u back to China, the police will take the knife if they like it and they would tell u that u r not allowed to take a knife like that, we all know that's bullshit. So be careful.

谢谢你,不过我可能没说清楚,我就是想买瑞士军刀
如果你说的是那种.....大刀-_-b我不敢买的:)

http://www.knifeoutlet.com/catalog/Victorinox_Swiss_Army_Knives/index.htm
http://www.knifecenter.com/knifecenter/sak/index.html