Sounds like an opportunity to me.
Ammo Delivery. No, I'm serious.

You know how the "Snap-On" tools trucks drive around to garages and stuff?

What's to say - under this law - that you could not have a mobile ammo shop? You could do a circuit - stop in location X in the morning, location Y in the afternoon - it's all legal and all that - and you don't "Order" ammo - you call them and ask if they "Stock" ammo - and if they don't, they say, "By the time we're in your area again, we expect to stock that."

Might be a bit expensive - and then again, maybe not. I haven't read the laws on selling ammo in CA, does this sound daft?