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Amazon [amazon.com] has Melissa & Doug On the Go Water Wow! Reusable Water-Reveal Activity Pad (Dinosaur) for $4.49. Shipping is free w/ Prime or on $35+.

Product Description from Amazon:[list][*]Water WOW! Reveal Coloring Fun – Use the chunky refillable water pen to bring 4 dinosaur-themed reusable pages to life with vibrant colors—no ink, no paint, no mess, just water![*]Reusable, Mess-Free Play: Each spiral-bound page starts with simple line art and reveals colorful scenes and patterns when wet; let dry to play again and again—perfect for screen-free creativity and hands-on play