This week, Sharpie pens are BOGO Free and there is a $2 Art Skills/Sanford monthly +Up available (limit 4 rewards) I found the 2 pks for only $3.19:
Buy (2) Sharpie 2 pk Pens $3.19
Pay: $3.19, Get Back (2) $2 +Up rewards
Keep in mind that if you have done the Artskills monthly reward 4 times already, you will not be able to complete this deal.
There is also a $4 +Up available when you purchase the Assorted 8 ct pens. They are BOGO free as well this week and I think they are their own +Up reward so if you have maxed out the Artskills +Up reward, you should be able to do this as well (there was no limit stated on the tag)
Sharpie 8ct $9.99
Pay: $9.99, Get Back (2) $4+Up rewards
= $1.99 for two packs