Buckle Up, Buttercup is available electronically through Amazon and KindleUnlimited after release day on May 21st, but if you'd like an electronic copy, you can get it through this listing. 
 
Pre-order Buckle Up, Buttercup directly from me, and you'll automatically receive the foiled bookmark as a pre-order incentive as well!
 
The digital file will be delivered to you via BookFunnel on May 20th, the day before release.