I think this is a little glitch in the couponmom program.
When you need to buy multiples to use a coupon, the unit price doesn't always calculate correctly (look at the suave for 1.00, coupon is for $1 off 2, and it shows ending price is FREE. True, the second one is free if you look at it that way, but I prefer to look at it as per each, so I re-calc the final price to reflect that: 0.50 each).
To answer your question, I bought the yogurt at Fry's this week, and my Fry's is TRIPLING, so I bought 6 for $3.00, less the .40 coupon that was tripled to 1.00 (triple value caps out at 1.00), so I paid 2.00 for all 6, which comes to .33/each.
You weren't doing anything wrong.