Desperately seeking brood

As described on the Forum side, I have a queenless swarm in one my hives. They do have queen cells built but definitely not enough workers to sustain themselves even when a queen does emerge. Does anyone have a medium frame or two of brood they could spare? My second hived swarm, although only three weeks old, seems very strong and genetically varied. I should be able to return the favor with their brood sometime in the future. I am in Santa Monica.