Amazon carries the Tattu brand batteries; their US Warehouse is in San Ramon, CA. I've used them successfully for years with my quads and planes, and love them. Only had one go bad, and it was due to a crash, so not the fault of the manufacturer.
No, they're not the $6 Rhino batteries sold at Hobbyking, but they'll get to you relatively quickly. I've been ordering batteries from them and 1-2 days from the Bay Area to San Diego. From the Bay Area to elsewhere in the US? A week, at most, I would imagine. You could also check out Dinogy Lipos out of Las Vegas; Silent Electric Flyers of San Diego loves their batteries.
If you want cheaper, you're going to wait 2-6 months for it to come by Chinese Junk, where it will apparently be put onto a boat, then the boat will be carried by hand across the Gobi Desert, through Asia to a point in Europe and the Mediterranean, then set down on the coast somewhere where they then disassemble the boat and reassemble it, put it in the water, find out it's leaking after it settles to the bottom, then they'll send down divers to retrieve it, pull it back up, reassemble it correctly this time and then ship it out. However, it will then be hijacked by pirates, rerouted back to China and sold on the black market, and start the process of delivery all over again to you until it gets through the pirate blockade, to land on whatever coast of the United States is opposite to you. Then, once it has arrived, it will sit in customs for several months while they decide if it has COVID-19. Once it's cleared, it'll then criss-cross the continent in its attempt to get to you, several months later. LOL
I've had bad experiences with CHEAP electronics that I've tried to buy - cheap servos that have had shorts in the wiring, bad ESCs out of the packaging that had timing issues...Sometimes, going with the cheap, no-name brands that nobody's ever heard of aren't the best way to go. How cheap is it if you have to buy 2-3 before you get a working one?
You don't need to go the full on end either, but just be aware that the cheapest options aren't always the best.