Amazon with merka has the 8-Pack of merka 17" x 22" Educational Posters (Explorer Set) for $20 - 15% off coupon (check "Apply coupon" box) - $1 off with coupon code 058CLWQC [Exp 4/29] = $16 with free shipping on $25+ or with Prime. Poster themes include USA and world maps, human body, solar system, calendar, seasons, and money.