The Enjoy Printable Coupons blog has a brick list of 300 printable coupons. You can see them here.
If you haven't check out the Coupons Inc. brick list on my sidebar you can check that out here.
A brick list will link you to potential printable coupons. I have found that not all of the coupons on a brick list are always available, but it is a good place to check if you need a specific coupon.