Can someone introduce me where to buy cheap and good air humidifier ?

I would recommend biocair humidifier! http://biocair.com.sg I bought from baby fair. There's one mummy's market fair upcoming this end of July. I have 3 kids. When one fall sick, the other 2 will follow suit. Ever since after having this product in my house, the chances of them cross-spreading germs and falling sick together has been minimized. It's probably the best investment I've made! Health matters more.