Yes, the basic Kindle is $89. The basic Nook is $99. The color & app-capable versions of each are at least $100 more each. So you end up spending some $600 on four different tablets and you still don’t have an iPad which can do all that and more in one package starting at $329.
Gonna have to disagree with you on that. The Kindle Fire is $159. Not sure what you are thinking the Kindle Fire can’t do.