I got the Narnia steel on ebay. I've seen copies go for around 60-70$, but I got mine for around 16$. One will eventually pop up if you are patient enough.
Before I had a blu-ray player, I ended up getting the DVD versions. The very first one I ever saw advertised was V for Vendetta. I still have them even though I have the equivalent blu-ray versions. Can't seem to part with them just yet!
Thank-you Future Shop for getting me into the game of collecting steelbooks!