I guess I was (somewhat) lucky. I happened to find Crossroads at my local library -- no charge, no muss no fuss. Well, almost.
See, they had the DVD title in the card catalog, but it had to transfer from the main county library. It was a bit embarassing asking the librarian for help to put in a transfer order. When I asked about "the britney spears" movie, she actually knew the title without looking it up. We both agreed not to ask about how she knew that. In the end, to avoid looking like a total perv, I mentioned Rifftrax and she actually seemed a bit interested in the whole thing. My order went in and two days later I got it, and as I said no charge! Aside from the Rifftrax itself, very thankful not to have spent any cash on this thing.
During the in-between time, I was also able to dig up the library's copy of Star Trek V, so I scored two hard to find titles for free!