A lot from free sample sites. Here are a couple that I use to find them (often they link to other sites) and then I try to figure out a pattern in the URL to get a full set. Bit Torrents work, just found Shareaza which is working great, a bit slow, but more people need to get on it... you can use torrents, as well as it utilizes many p2p networks
moviesguy.com
dansmovies.com
are two of the links I use
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