Words of advice from a man who spent several years doing this sort of thing:
If you feel strongly enough to put stuff like this on windshields, pony-up your own damn money for a batch at the print shop. Aside from the ethics of spending someone else's money, Murphy's Law guaran-fucking-tees you will leave your master copy in the machine at work and get all sorts of jammed up with your boss.
As one who has distributed many 100K's of fliers, I suggest you make them into 1/4-page 2-sided -- MUCH better for windshields, and 4 times more fliers for your $$. Your local copy shop will be happy to help you with the layout and they will quarter-cut the pages and box them up for you for a very reasonable price.
If you really want to be a little stinker, ask the print shop about sticker paper. :-)
Explore the use of colored paper. Doesn't add much to the print price.
8.5x11 is more suitable for posting on bulletin boards, light poles.
Carry a few thousand in a deep shoulder bag, work with a friend.
Try not to embarrass the movement you're attempting to promote.
ETA:
You should have a good understanding of what constitutes trespassing! You probably do not have that understanding now.
You should also think carefully about who you're trying to reach with what message before you flier a particular location.
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