One of the best golf drills I've seen is to put the alignment sticks in parallel then put a golf ball in between. Setup as though you are going to chip the ball. Now take the club back and punch through. Make sure your club stays within the alignment sticks on the backswing and follow through.
According to Michael Breed, if you practice this drill, you will be able to hitter crisper chips.
How much and where to buy the alignment sticks? Alignment sticks are $15 and are available from Amazon.