Where do you find your grocery coupons?

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I have been trying to find grocery coupon sites that don't require you to install a special printer software. I like to print my grocery coupons out at work before going shopping, but don't like to download superfluous programs onto my computer and junk up my machine. Do you print coupons out from the internet, or do you clip them from newspapers? Where do you find the best coupons?