Ma'am, you may like to read: https://www.systemsofexchange.org/post/the-quakers-and-the-origin-of-fixed-prices

Fixed prices for buyers are a very doctrinaire Classical Liberal thing. 

Marxist-Leninists Communists were for fixed prices, nearly as much as Classical Liberals.

If you feel, as I do, that discriminatory pricing is an abuse of market power (even if for non-market ends), then we are in the minority, and many of our fellow-travellers really are Communists. 

 Communists didn't allow for price-discovery, tho. They centralized price-setting.

Obviously, I am a classical liberal. 

 Quite.

Nonetheless, they are among our allies on this specific issue (pricing equality for buyers), while "capitalist" FAANG corporations, our nemeses.

Hilarious really 

 I'm used to that, though. Most people I know lean left and I agree with them regularly, on economic issues. 

 Most people I know lean left, and I disagree with them regularly, on economic issues (among others).

You must associate with a better grade of Leftist :-D 

 I am probably just more open to their style of argument and actively extending grace.