Vii systems are are easy to come by in China if you know where to look. It's just that Chinese people know it's a scam. They overcharged for the console to try and capture some of the Wii fad going around, and now it's dead. If you've seen some Chinese websites and blogs at the time, you'll note people even opened up the console and found iron bars fixed to the case to make the product seem more substantial.
In general, you don't see it for sale openly anymore because no one wants one. Even if you lowered the price, I doubt many local Chinese would get one. Normally you just see them quietly in a corner, with no price or heavily discounted. Unless the shop is living in a fantasy world and still keeps the price high (Which happens, but no one really gets suckered into it).