I found a Spectra SE on ebay for about $20, and I like the Spectra color and proportion much more than the type 600. The film is harder to find (as in you can't go into K-mart and get it) but some Staples do sell it. Film is about the same price though. Another way to go, as someone else recomended, getting a peel apart film camera. With that you could get P/N film, different color films and have the possibility to do emulsion transfers.
I love using a polaroid as a snap shot camera. There are actually people who ask me what it is. One woman in Florida asked if it was "a really old digital camera." I told her, "Yeah, it's olde school digital."