If you have a long flight or road trip coming up this summer, check out this deal! Hollar is featuring adult coloring books for as low as $1.00! There are tons of different themes to choose from too. These are the perfect way to pass time and chill out during a long trip. 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. Don’t forget that a minimum order of $10 is required at checkout.