Back to the Amazon "is it worth it issue" --- An example from today as to why we like and use Amazon. The wife reads on her ipad at night but she has trouble falling asleep after that and eyes ached a bit. She was told by our daughter that she could get a blue blocker screen cover for her ipad that would help with that.
She asked me to get that for her. My options: a two-hour round trip to town - heading to I don't know where to find that for her and not knowing which kind to buy anyway or check it out on Amazon. On Amazon I read the reviews, the questions, and learned that the blue-blocker screen covers do not work all that well for some users and have other issues.
Some reviewers suggested blue-blocker glasses instead. I told my wife about that - she said she wears reading glasses and did not want to wear blue-blocker glasses over those. She asked about clip-on blue-blocker glasses. I checked that out - Amazon had a variety of those. Good reviews, not expensive, and I could get a 2-pack (one for me). Wife said that was a better choice as she could also use the clip-ons with her iphone, and as they reduce glare, she could try them out for night driving - clipping them over her other glasses.
I like to buy local, but the advantages of Amazon in the circumstances made it the best choice.