Buying eBooks on the iPad is a pain unless you use Apple’s app. Basically, I can’t buy a book from Amazon or B&N on my iPad because they don’t want to give Apple a cut on the sale. Consequently, whenever I want to buy a book I have to go to my smartphone, Android tablet, or notebook computer. It is a disappointing hassle.
You can make purchases on the iPad by visiting Amazon or B&N in the web browser. Still a hassle, but it can be done on the same device.