OK, here's the deal: NF puts up as much material as it can. It is, however, obliged to obey CONTRACTS. Sometimes contracts expire. Sometimes the supplier chooses not to renew.
Sorry you aren't finding what you want. But guess what: maybe in a couple months it will be up. Some movies pop in and out. Annoying, but it happens. Considering everything else NetFlix has up there, I have yet to have a night with nothing to watch.
Incidentally, this happens with DVDs too. They plan to get ____, but for some reason, the distributor doesn't want to deal with NF. NF remains hopeful that they will eventually get the movie/show, so they leave it in the catalog.
Then you have HBO, which was giving NF everything for streaming because they didn't realize what it was. Suddenly, they see that their shows are popular. Someone at HBO perceived this as a threat to their DVD sales (because regular rental stores don't worry them?), and pulled all of their shows (Dexter, Penn & Teller's BullSh*t, South Park, etc). Everyone blamed NF, but it was HBO's doing. What's more, HBO forced NF to buy DVDs at full retail cost, rather than the usual merchant rate. In short, HBO policy to NF is being set by a bunch of petty, greedy camel-droppings.