Buying alternative music in Beijing (地下摇滚乐）

[akdn]

Alternative music record shops in Beijing?

In particular, where would I be able to pick up some of the more obscure CDs on these labels?

http://www.modernsky.com/

http://www.pulaymusic.com/

And while I'm here, any other suggestions of decent alternative music labels?

I'm not interested in Cui Jian, Tang Dynasty, Hei Bao, and so on. I’m enjoying collecting alternative / experimental / electronic Chinese bands, who are producing music today.

I already have lots (Muma, recent Dou Wei, Leng Xue Dongwu, Bing Yisheng, Shetou, Shou Ren, Supermarket, Beng Dui), but want to continue the explorations.

Thanks.