Yup, I also cancelled my prime subscription, for the exact same reasons as you. Their prices aren't as good as they used to be -- I shop around now.

All this stupid "add-on" shipping stuff is silly and was making my life a bigger hassle. I like Amazon because it was quick and efficient to buy, but that seemed to cause unnecessary friction.

And the real reason is that they made it very difficult to cancel Prime! 5 months into my membership, there was no way to cancel at the 1 year mark. They would only provide the option to cancel NOW, which is ridiclous. I actually had to put in a special request to customer service to do this. That was ridiculous and really changed my opinion of Amazon as a customer-focused company. It was like AOL tactics from the 90's.