Something like this:

http://shop.10010.com/netcard/getOnlineCardInfoByGoodcode.action

Not exactly the same as I used though. In the city where my parents live, my computer found about a dozen wifi spots, half of which were not protected. One thing bothering is that it appears people there only switch on when they need them (unlike in the USA people leave them on all day long), so usability is not quite reliable. Well, when you "cen4wang3", you really cannot ask much.