LOS ANGELES — Art fairs have over the last three decades become the great organizers or aggregators of the art market, bringing mom-and-pop galleries and their bigger counterparts together under one roof — or these days, given the coronavirus outbreak, one website with multiple viewing “booths.”

But in Los Angeles, several galleries have independently organized and created their own marketing website, galleryplatform.la. They have also formed a group, Gallery Association Los Angeles (GALA for short), with plans to continue long-term as the only citywide art dealers’ association.

The association lists 60 contemporary art spaces across Los Angeles, including branches of the giants Gagosian and Hauser & Wirth, as well as the smaller homegrown venues Anat Ebgi, François Ghebaly and Parker Gallery. The art dealer Jeffrey Deitch, who splits time between Los Angeles and New York, said he had the idea of a website “to generate excitement about the L.A. gallery scene” shortly after both cities’ home-sheltering orders.

“Nobody expects a frothy art market right now, but we think people do want to buy works that are moderate in price and stay engaged with art,” Mr. Deitch said. “What we’re hearing is that some galleries have not made a single sale since the lockdown.”