these 2 on seans blog will help you a lot too...
http://moominsean.blogspot.co.uk/2008/04/polaroid-primer-peel-apart-films.htmlhttp://moominsean.blogspot.co.uk/2008/12/polaroid-pack-film-final-lesson.htmlthe land list page (linked in first post) will tell you what battery each camera takes. Most of the old folding type use old 3 or 4.5 volt batteries, that are still available on ebay, just a little more pricey. Lots of resources on the web to explain how to convert to three 'newer' AAA batteries, but personally I've always used the older type batteries that have lasted ages for me without any problems
Lots of the hardcase ones (eg model 10, colorpack, model 30 and so on) use type AA batteries which you'll no doubt have in a drawer somewhere...
Other things to look for from the seller:
- corroded battery compartments can cause issues - these cameras rely on the battery to meter the light, so if the battery doesn't work, the camera is useless
- ideally if the seller can test it - if they cock and fire the shutter in low light (with or without film but needs a working battery) then they should hear 2 clear clicks. if they are a polaroid user this will make sense to them
- holes in the bellows can cause light leaks but these can be fixed relatively easily, although try to avoid if possible
- corroded or dirty rollers (the bit that spreads the developer paste) can cause issues, but should be relatively easily cleaned
- some have one window viewfinders, some have two, many people prefer the single window zeiss ones, but I am not bothered either way personally
- if you buy one with a 4 way scene selector you have a little more flexibility with 4 aperature settings, alongside the lighten darken wheel, you can use the camera in more extreme light conditions than one that only allows you to choose 75 or 3000 setting
Obviously most of these cameras are 30 plus years old, so hard to guarantee them... but it is by far my favourite form of photography and once you get going you will get some amazing results!
Hopefully sean will jump in here as he is one of the main experts!
I hope this helps...
I'd recommend reading the links above, the land list pages and look at the comparison table on the instant options site to see what cameras have what functions and generally get a little more understanding. then choose your budget (you'll get one from £5 - £800 on ebay) and get buying...
I used a 340 for about 5 years that cost me £4 plus postage and it was my number one camera for a long time...
let us know how you get on!