Sweet! If you need a little Adult therapy, what about these fun coloring books? Hollar has a great selection of Adult coloring books and pencils starting at only $1.00. But you can also use coupon code JAN25 to take 25% off one item. So that means you can grab one for only $0.75! Plus,shipping is free on order of $10 or more for first time buyers. Returning guests can score free shipping when you spend $25.00 or more.