If California is anything like New York, your options will be limited. When I started in this hobby, you could still go to Radio Shack—it was pathetic, but it existed. And we had two privately owned electronics shops in Rochester. One bit the dust a few years back, and the other one couldn't make it through the tariff war plus Covid.
I would strongly recommend buying a bunch of key parts in bulk. You're definitely far enough into this that you'll use the stuff. Small Bear has some great options in their
Parts Kits section. I got these a handful at a time and now just keep a running note on my phone of stuff I'm running low on so I can reorder in a cost effective way. These parts are
way cheaper when bought in bulk.
You may have noticed that certain values are much more common than others. Multiples of 10, 22, 47, 68, etc. This means that you can get a pretty useable stockpile as a hobbyist without having to get every single value. The Small Bear kits are a good reference point, even if you want to source them somewhere else. Like Mouser. (You can tell I am still an electronics hack by the fact that I still won't order from them unless someone provides the part numbers!)
Good luck!