I sold a real D and M together in as new condition last month for $1436 on gunbroker. It just depends on who wants it. I would say anywhere from $500 to $700. Thumbhole Sporter version $400 to $500. M version $500 to $600.
I am Not impressed with those preban Norinco SKS that take AK mags. I had one maybe 8 or 9 years ago and it was Not reliable. Mags were hard to put in. I sold it to a dealer from Richmond and sure never missed it at all. I handled one at the last Harrisburg Pa Show. It was NIB and the guy wanted 700 for it. I was allowed to insert the 30 round mags in it and All had problems with fitting. I said thanks but no thanks as I had seen this "show" before. The dealer he will sell it on gunborker and get over a grand for it. I am sure he will!