This should make for a really awesome deal when candy bars go on sale for .50, which they seem to be doing quite often these days. Here is what your scenario will look like:
Buy (3) 3 Musketeers Bars .50 each
-B2G1 3 Musketeers Coupon (direct link)
I like to snatch these up and hand them out to the bell riningers outside of the stores this time of year.