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Answer:

I honestly go to every website... For the coupons.com coupons, I use my InboxDollars, so that I get an extra 10 cents for every coupon that I print and use from there. Then there's smartsource.com and redplum.com Redplum only has good ones during the first weeek of each month, after that the print limits are reached and the good ones will be gone. There's also couponnetwork.com and they actually show you on the site when they expire so you don't accidentally print ones that you won't be able to use.

After those sites, I google every product in the grocery ads and go to each company's website/facebook page. I check out their offers/promotions for coupons and then I click their 'contact us' link and ask them for coupons or to add me to their mailing list and include a mailing address in the message so they feel obligated to send something. Most of them will email you back within 24-72 hours and then send you cool stuff, recipe books and coupons in the mail within about a week.

After I've done all of that, I go to a coupon database:
http://www.passionforsavings.com/coupon-database/
and search up each product that I still don't have a coupon for. The database provides direct links or info on where or when the most recent coupon for that item was provided.

Oh! I almost forgot to mention MamboSprouts.com for organic and natural foods coupons.

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thanks, I really need to get better at saving money. I hope to spend only 100 dollars this month. We shall see.