Check out this handy guide that answers all your questions on paying for your order with bitcoin!
From the guide:
While paying for cutting edge educational electronics using crypto-currency can take a little getting used to, we have made every effort to make this process painless and easy for you, our (mad genius) customers.
We have also added a number of Bitcoin related details to the Adafruit FAQ here.
Read on below for a selection of the items from the official FAQ — make sure to check the FAQ for our latest official FAQ updates.