The easiest way to see price discrimination is to go to the rich side of town and go to the grocery store. Observe the price of milk, hamburger, cheese and gasoline. Now to to the poor side of town, repeat.
Clue - if the rich folks think the price is too high on common items, they have the means and time to seek a lower price on commodity items. The poorer side of town is usually time and/or mobility constrained and won't do so.
I noticed that on different platforms (Windows, Mac, Linux), I will see different prices on things like airline tickets or car prices. (You'll need to use source obfuscation - EG hide your real IP). Hint - most car sites are run on exactly the same back ends as all the others.
Also - if you notice a letter code on price tags (pretty rare now days) think I N T R O D U C E S. 10 letters. assign a number for each. This is the cost of the item to the store. Stupid store owners will use 0 - 9 in order. The most common is to assign either even or odd numbers to the first 5, then vice versa.
Smart shop keepers use an initial digit or code, then pick any 10 letter word with no repeating letters. There are over 80 words starting with "B" that don't repeat letters - BLOCKHEADS is one. I like to find these shops, figure out the "code", then consistently offer the owner (Never an employee that might not know the code) exactly one cent above their cost. I like to see just how long it takes the shop owner to figure out I know what he's doing. My all time best effort is 22 years and counting - but he may just be playing stupid. When I have a special order I can't get anywhere else, I'll pay for it up front and don't haggle the price.
That said, I'm a firm believer in enlightened self interest. In my hobby, there are a lot of things I could order on line and save about 40%. But I still buy local and pay full retail. While I could save some bucks by ordering a week in advance, it's in my interest to have it local, where I can walk in and walk out with what I need.
Sometimes a cheap price hurts me more in the long run than other considerations. Besides, despite violently opposing political views, this is a guy that I could call at 3AM and know he'd come help.
And vice versa.