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i found a guy on Craigslist (how did we ever survive before Craigslist?) that salvages them from lots of businesses and then sells them on. i know Earthfare (organic grocery store) carries them around here, and i'm sure many other places do to.
i'm sure cheesecloth would work just fine if you aren't in an area that gets heavy rain. if you get a downpour, i would just worry that it would take too long for the water to filter through the thicker fabric and it might overflow. you can usually buy big rolls of hardware cloth for about $6, though. and yes, window screen should work fine if you have it laying around handy (hardware cloth might actually be what they use for window screens... it's all wire mesh).
there are instructions all over the internet on rain water collection systems that are more detailed than mine and might also have suggestions where to find collection tanks.
also, gray water (which is what rainwater is called in building terms) can be used to water your plants, wash your car, fill the kids swimming pool, and TONS of other things. you can even do a little bit more work and run your gray water system into the house to flush your toilet (this requires a pump, though). it saves you money, cuts down on the water that needs to be sanitized by your county, and helps your property from getting waterlogged. you will be amazed at how much water you can collect off the roof!