Favorite book store - I visit my independent or second-hand store.

Chain bookstore - I usually shop and buy from Barnes and Noble, Target, Walmart, Borders, etc.

Amazon - I either download to my Kindle app or ship to home.

Free options: I checkout from the library or trade books with friends.

iBooks - I buy books through iTunes

Subscription service - I subscribe and pay a monthly fee for Oyster, Scribd, or Kindle Unlimited

Other: