I just bought an M11/9. While I didn't look too far and wide, I watched the usual boards, went to the local shows, and called the local dealers. Probably was looking for around 3 weeks before I bought. OK, this is a pretty short time, but we're talking an M11/9 here, for which availability never used to be a problem.
First, these little buggers are pretty hard to find now. Second, cost has jumped up alot in the last few months. Expect to pay $2K+ for a NIB on a form 3, if you can find one. Used, but not abused, on a form 4, maybe $1600-$1700. Hopefully you can get lucky and find one in-state and avoid the second transfer tax - otherwise, you may as well look for a NIB one on a form 3.
With Tactical Innovations recently ceasing their sales, I'd imagine this is only going to climb higher. Although I can't think they sold too many at the prices they were asking for the previous month or so before this.
Non-PS MAC 10's or MAC 10/9's seem to be easier to come across than a M11/9 currently, and as a result, a bit cheaper, but I imagine they'll catch up shortly.
Stens and M-76 clones for $2000? Maybe a few months ago, but I didn't see any priced anywhere near that when I was looking. Seems to be a whole different ball game now. As mentioned, the Vector UZI's kept the market down for awhile. I also believe the "Shrike-mania" that jacked the M16 prices up really effected the low end market as well. Those who would previously had skipped the low end guns to save up for something like an M16 now find the mid-range guns ain't so mid range anymore, and the low end is all they can afford. As a result, demand goes up, price goes up.
Your best bet may be to find something in state on a form 4 from a private individual that may not be quite up to date on current pricing. Someone selling at prices from 6 months ago can get you quite a deal.
Rocko