I posted on these before but the posters were the kind that can be printed on standard paper which means they weren't very sturdy and/or needed to be laminated. They are simple to design on your own or you can turn what I have created into an 18"x24" poster and have them professionally printed. Simply download my design and have them printed at a place like Short Run Posters for about $3 each. You'll need a good resolution so I've got the files in a couple of different forms. I've found the pdf works best at Short Run Posters, it's a good deal, and the posters are a good quality.
Single Church Year jpg Advent jpg Christmas jpg Epiphany jpg
Single Church Year pdf Advent pdf Christmas pdf Epiphany pdf
Lent pdf Easter pdf Pentecost pdf