Inspired by DIY acrylic charms on taobao, I decided to make Ishin-themed DIY acrylic charms after I finished playing that game :D ...
You can buy stickers by themselves (complete with free US shipping), or you can add 2 omamori acrylic blanks to your order--that said if you buy all 4 sheets, 2 acrylics will be included in your order free of charge.
Also here's a vid that shows how I add stickers to the acrylic blanks.