Here are the coupon book deals that run from 1/2-1/27 at Costco. These books come in the mail or you can often find them at the customer service desk in store. Occasionally the cashiers have the booklets as well but it is best to have it with you just in case.
For the items listed as instant discount there is no coupon needed. The items listed as Costco coupons, you just need to scan the booklet at checkout and all the coupons will come off. (There is no need to actually cut coupons.) Usually the cashier will just do that automatically for you.
These are all prices from my store so there may be some variation from region to region. I would love to hear if you are finding the same prices that I do at your store (and what state it is in!)
You can see the master list of Costco Everyday Deals here.