Slickdeals has a list of most of the printable coupon sites out there:
http://slickdeals.net/forums/showthread.php?t=755807If you have a Kroger card you can add electronic coupons from these sites:
Cellfire.com
Kroger.com
pgesaver.com
shortcuts.com
Make sure you either choose carefully when adding those to your card or scan your Kroger card at the end right before paying. When you scan your Kroger card it starts using the coupons you've loaded on your card first. When you go to use the paper coupons they will be rejected if they are for the same item, even though they might be higher value coupons than your eCoupon. Scan your Kroger card last after your coupons and it should take the paper coupons.