Sports Authority offers coupons on their website, sportsauthority.com. Additionally, coupons can be found at livingfrugal.com, groupon.com, and many other websites.
What I would do in your situation would be to log onto the local sports stores websites and sign up for their weekly e-mail. Often times in these e-mails they send you special promotions/coupons that aren't available to anyone but the e-mail recipients. When the product you are interested in shows up on one of these promos you can then compare pricing between the different stores.
There are many websites that offer coupons. A few good ones would be printable-coupons, the official websites of grocery stores, and coupon blog sites.
There are many places where you can get coupons for Champs Sports. The first place to try would be www.champssports.com/coupons/ to see if they have any coupons relevant to you.
There are several places to find Stouffers coupons. One would be www.coupongeek.com, another would be on Facebook and still another would be at www.mahalo.com/Stouffer's coupons.
There are a lot of websites online that sell fast food coupons online. One of the websites that I would recommend is Freestufftimes.com They show you where you can get the best deals/coupons online.
There are many fantastic websites to get coupons from that will help you spend little to none. A few of those couponing websites would be grocerycouponnetwork.com and couponmom.com. They offer coupons for nearly every store.
The manufacturer site JJill would be the best place to get current coupons for JJill. Other websites like Retailmenot, coupons and Thekrazycouponlady will also have these coupons.
Trading coupons is a great idea. I would suggest checking out www.ecoupons.com.
For grocery coupons I always go to the companies webpage. I feel that you can get the newest and best coupons from the business itself because they are promoting it.
You can get Black Friday coupons at all the usual places you would find coupons such as Retailmenot. You can also find coupons in newspaper inserts and flyers which are delivered to homes and at the websites of the retailers themselves.
You can find eastbay coupons online on several different websites. The safest (and probably most accurate) place to find coupons for eastbay would be their official website.