A quick story. Around 13 years ago I purchased two Dahon folding bicycles. My running was nearing the end, and I wanted to be able to bike instead on short regional vacations.
Anyway by now the bike has had plenty of regular use from home. A few days ago left for a ride, and one pedal was broken. Folding pedals, for travel.
I checked Amazon, and they carried what looked identical to the original wheels, for under $11 delivered in two days. I pushed Purchase.
Two days later the pedals arrived. I had checked with the bicycle maker Dahon, and they charge $34.95 (if I could find a store selling them).
The shopping world has changed. Plain Amazon Prime is a fantastic value. I watch streaming video content, listen to music, get free shipping on purchases at great prices, etc.
And think Amazon, started as a new/used book store. I know because I shopped online in internet early days.
They have an extremely efficient business model, from top to bottom (from shopping website to delivery-and follow up).