With orders of $25 or more, Amazon offers Prime members the Melissa & Doug On the Go Scratch Art Fairy Tales Color-Reveal Activity Pad for $2.25 with free shipping. (Animal Families is available for a little more.) That's $2 under what you'd pay in-store locally. It includes a wooden stylus.

Note: This item is part of Amazon's "add-on" program and can only be purchased with orders of $25 or more.