[camaraderie]

JRP...there are no processing fees from Amazon. You may have been dealing with one of their partners that sells things ON Amazon.
My most recent purchase from them was a 6 pack of Pur water filters. Shipping was free. The price was $51.99 with NO sales tax.
Walmart has a 4 pack of the same filters for $40 + 6.75% sales tax...or $43.70 total + a round trip of 36 miles...so 2 gallons of gas.
The entire transaction took me LESS than 2 minutes. Arrived in 5 days.

The only trouble I've ever had is when I've dealt with their third party vendors...but even there...they stand behind the transaction to help if needed.

I did not buy a single Xmas present from a brick and mortar store this Christmas. Amazon's wish lists made it easy.
That said...I do shop elsewhere on the web and I have found others beating them on price occasionally or having something that suited my needs better. Just find them so easy and the best so often.