Now 12.84 + $10 off when you spend $25
Let's do the math together...
You need to spend $25 to get the discount, so lets say i should buy 2 sets of these for $25.68 and minus the $10 offer i'll effectively get a total of $15.68 which is what the OP had originally.
But yes for one pack its $12.84 or 8 Pens for $15.68.