I am having the posters printed at Walgreens because that's the only place I could find that does large posters for a fairly reasonable price. I place the order online and am having them shipped to me. Each poster cost $30. Shipping & handling is between $6-7. They estimate it will take about 10 days.
Here they are. You're welcome to use and adapt as needed. If you want higher resolution versions, post a comment to let me know.