I bought some poster frames at Ikea. Unfortunately I can’t remember how much I paid and I think you can only get them at the store. They are a weird size: 19.75″ X 27.75″. I had this poster example (see below) printed at posterbrain.com for $16. Walmart has a 24″ X 36″ poster frame for $15. Joann’s has 18″ X 24″ for $14.99 and if you can use a coupon for 40% or 50% that would bring the cost down considerably. You would only incur a cost one year for the posters and frames. The following years, you would just switch out the dates and theme.