Why this NYC espresso bar keeps its coffee at $2.50 a cup — and staying that way — as others soar past $6

It’s a real jolt to the system.

New Yorkers have never been forced to pay this much for coffee, as inflation forces Gotham’s grounds merchants to jack their prices ever higher in an effort to keep up with the joe-neses.

And yet, a few brave bean depots in the Big Apple are quietly pushing back on the buzzkill trend, serving up espressos, lattes and more for as little as $2.50 — under half the average price for a cup of good coffee in NYC these days.

Upper West Side espresso bar Casa Salvo is a brand-new addition to the frugal fraternity, thanks to chef and creator Salvo Lo Castro, who believes that the joy of good java should be experienced by all income brackets.

“I produce coffee, and coffee must be a drink for everyone, not something out of this world,” the Sicily-born foam frother told The Post of his new shop, located at 473 Amsterdam Ave. at 83rd Street.

At Casa Salvo, every drink on the menu — from a quick espresso to a lavish cappuccino with pistachio cream — costs $2.50. That’s the same as an Americano at 7-Eleven, and half of the average at Starbucks nowadays.