I read about this deal last night; I was going to wait to confirm it works but I am seeing it posted all over the place now so I will go ahead and let you guys in on it. :)
This week there is an unadvertised sale on 3 Musketeers Truffle Crisp bars. They are on sale for 3/$2 ($.69/each) this week. When you buy 4, you will get a $1.50 RR. I was also able to find coupons on eBay for BOGO Mars candy bars; if you check around, you may also be able to find them.
Here's how it works:
Buy (4) 3 Musketeers Truffle Crisp bars - $2.76
Get $1.50 RR
...$1.26 for 4 or $.32 each.
If you come across the BOGO coupon:
Buy (4) 3 Musketeers Truffle Crisp bars - $1.38
Get $1.50 RR
...4 FREE candy bars and $.12 money-maker!
