You do your homework, of course!
You have to research prices and decide what "is" a "good deal".
What is at "great deal".
Here is a link to the type of list you can make for yourself...This is a great tool when shopping at store that might actually mark up items and put them on sale...yeah right!
This was put together by southernsavers.com
She has also put together a blank sheet that you can put your own list together.
Here is the link for that list.
This is a very helpful tool, because with all that life hands us...I don't think I can keep one more thing up in that head of mine!