Choosing a Polaroid camera depends on a few factors, though things are changing rapidly with Polaroid discontinuing its film in 2009 and the Impossible Project trying to resurrect integral film. Because of this, the only cameras I would recommend buying right now are pack film cameras since Fuji still produces colour and b&w pack film. Answer the questions below to see what kind of Polaroid pack film camera would suit you best:
Do you want a pack camera with manual exposure controls?
YES. You'll need look for a model 180, 195, or a 110A/B which has been converted to pack film. Expect to pay $150+ for these cameras!
No. Go to the next question.
Would you like a newer style pack film camera with electronic flash?
YES. Get a Propack camera. This newer style of camera has guesstimate type focus and the viewfinder is not parallax corrected. It also has a plastic lens. Polaroid discontinued producing them back in 2003, but you may be able to find them used on auction sites.
No. Next question:
Are you willing to hunt down a battery for your camera?
YES. Good choice! Go to the next question.
No. Get a newer style pack camera like the EE100, Reporter, or any of the hard bodied pack cameras. Refer to the camera chart for cameras that take "AA" batteries. All of these cameras have guesstimate focus and a non-parallax corrected viewfinder with a plastic lens. You'll still need to hunt down flash cubes for these cameras
Do you want a camera with a few extras, like a nice viewfinder, glass lens, and optional accessories?
YES! Look for models 100, 250, 350, 360, or 450 camera. You can find these on Ebay or at garage sales/swap meets/camera shows. You can normally pick them up for under $10. All of these use flash bulbs/cubes except for the 360, which uses a dedicated electronic flash.
Not necessarily Any of the other 100 - 400 series pack film cameras will fill the bill. These generally cost the same as the above cameras, but don't have all the features. Take a look at the comparison chart to compare features of the different cameras.