I want to get a Chinese 20 round magazine for it as well.
There is one up right now on GB http://gunbroker.com/Auction/ViewItem.asp?Item=128488882 and one just sold "buy it now" for $60. I was going to buy the one that sold but decided to take the money and put it towards another SKS, the downpayment for the layaway. The 20 rounder Chinese is cool, but it really seems to add a lot to the gun in terms of bulk. I'll sneak up on one eventually, and may well like it.