It's my birthday tomorrow, and I have a gift card for $20 to bookshop.org! What should I buy with my gift card that is as close as possible to the total of the gift card without going over? (Factoring in shipping and taxes, we are aiming for $15.56.) ($15.59 is too much, I am feeling too crotchety today to give them my credit card for $.03 )

So far my best is "Images of Iceland: Adult Coloring Book" + "Games Wizards Play" for a total of $19.62 (there's another dollar shipping for two books.)