row 1 chip 1 is $4 shipped, chip 2 is $6 shipped, chip 3 is $7 shipped, or take all [3] for $15 shipped
row 2 chips 1 & 2 are $7 each shipped, chip 3 is $4 shipped
row 3 chip 1 is $6 shipped, chip 2 is $7 shipped, chip 3 is $4 shipped
row 4 chip 1 is $4 shipped , chips 2 & 3 are $6 each shipped