Valpak and Smart Source are great ones to coordinate with the sales in the paper. It usually is about 3 weeks until you will see them but start clipping now and then watch your local store ads for what products go on sale.
The Grocery Game is a great site but you do have to pay for it. I got a few tips from it and used to do it on my own, although it is time consuming so it did not last too long with a young baby at the time!
Check your local library as some of them have coupons in a huge file system type thing. I miss that out here but I know a friend of mine who lives near you has that at her library.
Oh yeah, just cuz a coupon expired does not mean a store will not take it. I would say about 90% of the time I have been able to use expired coupons. Also, the coupons you get from like Walgreens- those are mfg coupons and can actually be used anywhere. Just make sure it does not say it can only be redeemed at Walgreens or Jewel or where ever.
Just do a Google Seach for online printable coupons, you will get a bazillion choices. Some you have to sign up for, some you have to download the program to print it etc... I have several that I have in the past downloaded with no problems at all!
Also, make sure you are not using coupons just to save money but it is things that you will actually eat! I do not know how much money I have wasted in the past trying to use coupons but have absolutely no desire to eat the thing we bought!
One last tidbit of info that I have learned! Sometimes it is worth it to drive further to go to a different store. I drive 45 mins to go to Woodmans and Caputos. I have a Dominicks, Jewel, Aldis and Super Walmart all closer but have found the best savings at those 2 stores. Only bad thing... Woodmans will not let me use printed coupons from the computer and Caputos is only cheaper if I am buying sale items! Know your prices between stores too! That helps a ton! Super Walmart charges $3.75 (last I saw) for a Red Baron Pizza where Woodmans charges $3.25 and Jewel is even higher!
Good luck saving money! I know with times being tight and lil ones that seem like bottomless pits it is hard to do! Blessings to you!