I'm not sure this is possible without breaking the entire concept of money. So long as money is a thing humans trade their time for to pay for living expenses and beyond, it can be used to bribe, coerce, etc.
you could achieve this by: giving everyone a basic amount of money, so they are on a more equal footing to benefit from opportunities.
Reducing the powers of money is tough (and kind of a game of whack a mole) but that doesn't mean we shouldn't try.
As it turns out it's the Decentralized that's the important part. You need many people making decisions for productivity to flourish. Rich and powerful making few large decisions simply loses every time.
Nordic countries? Canada/UK? Though they are socialist, not communist.
There's not much to point to other than short lived revolutions and communes, or ongoing struggles, such as:
* Aaragon/Catalonia in the Spanish Civil War
* Ukrainian Free Territories in the Russian Civil War
* The ongoing rebellion in the Chiapas, Mexico
* Rojava
* Paris Commune
* Shinmin Prefecture in Korea
And likely some others I am struggling to remember. All of these communities were/are attacked by competing states with enough force that it's hard to get a sense of what decentralized communism would look like outside of an active conflict scenario.