Buy any 3 or more wallcharts from this website (separate titles or multiples) and you will automatically receive 30% off your entire order. Plus, you get free shipping if you are in the US or Canada. That works out to be less than $14 per chart. The discount will be automatically applied after you click checkout (if it is not, you can also enter it manually as "SAVE30").
Note: A higher discount ($10 per chart) is available to schools, resellers, or homeschool groups wishing to place orders of 12 or more charts. Email me directly at email@example.com to place your order.