Some walmarts still have Boondock Saints and Robocop steelbook for 15ish $.
Don't know if its a fluke, but as of yesterday, my best buy still had a few I Am Legends. Same with Dane Cooks Tourgasm.
You can get Fight Club and The Omen off ebay for decent prices.
As incred said, you can preorder Cloverfield at FYE for 20$. They only need 5$ down.
The whole problem with them is they are usually very limited, and people love to horde them for the sole purpose of raping people on ebay. I remember picking up one of the Grindhouse steelbooks and someone was at the counter with 5. Luckily the cashier told him no.