Totally Target is definitely a good blog to get on. She does all the Target Matchups every week.
There are quite a few blogs out there that do matchups for the national stores. My current favorite is still Couponing to Disney because she covers most of them and does so much more. Then again, I am subscribed to like 15 blogs. So y'all can be deal finding crazy like me and sign up for a ton.
Reminder of must be on blogs if you live in the Houston area:
Houston on the Cheap
Cheap Eats in Houston