Unofficial Go Pro Accessories/Mounts? Any good?

I got a Go Pro over the weekend. Much to my disappointment, it didn't come with any proper mounts for a helmet. Harvey Norman seems to have the cheapest price ($20) for the official helmet mount. It seems a bit excessive for a piece of fabric with a plastic mount.

By chance or maybe is spying on me, I got an email about unofficial GoPro mounts. The equivalent helmet mount is $12 USD which still seems expensive from a HK site. Are these any good? Anywhere to get it cheaper?