I got it from this website, they support paypal, master card etc, you can try customer service for more details.
here is website:
http://item.taobao.com/item.htm?spm=a1z10.1.w4004-4774893071.2.ntr6Qw&id=41759565960
the price is 125 Rmb, which makes only approximately 20 dollar, once the payment is secured, they will send it to you via steam gift, yes, you will get it straight away.
this is just some informations i would like to share it with all your guys, if you dont trust it, dont go to dat website, i have bought it already.
or you can pre-order it from green man gaming with 20% off voucher, which makes about 32 dollar.