Monica asked about how to know which stores double/triple coupons.
This is my experience in TENNESSEE: Most every Kroger store doubles coupons up to $.50 every day. Publix also doubles coupons up to $.50 every day. Harris Teeter doubles coupons up to $.99 every day. Food Lion does not double coupons at all. Wal-Mart does not double coupons at all.
I did some research on the A Full Cup site to see what the coupon policies are on some other stores across the country. I've provided links directly to the coupon policies for each of these stores. You can always check your store there as well.
Aldi's - I could not find a coupon policy for them; I suspect they TAKE coupons but do not double. The link is to their website UPDATE from Reader Julie: Aldi's does NOT take coupons.
Food Lion - This is the link to the FL website. They do not double coupons, however, they do have their own Internet Printable coupons (FLIPs) that are worth signing up for if you shop there regularly. Other stores will often accept their coupons as "competitor's coupons". Sign up using their "Shopper's Companion Email" link. You can also sign up here to get more coupons and weekly specials via email from them.
Publix - Publix also offers free antibiotics (there are 8 included). Click here for more information.
Stop and Shop / Giant Foods
Food City - Food City also has several "clubs" to join: Wine Club, Pet Club, Baby Club and Kids Club. The links to these can be found by clicking the Food City Link
Cub Foods - Interesting tidbit on Cub Foods: often they will accept expired coupons (up to 90 days). Check the link for more information.
Do you have a store that's not listed. Check out A Full Cup to see if your store is listed. Click on the store and look at the top of the message boards for Store Information/Coupon Policies and click the link to find out more information. OR... drop a comment and I'll look it up for you!