Target sports usa typically has good stock at competitive prices. If you buy by the case you also get free shipping. Gunbot.net is good to compare prices and is easy to sort by cost. Doesn't take shipping into account though which some places will rape you on.
Home ammo deliveries banned in City of Los Angeles (where I just happen to live)?
No problem. I just have everything shipped to another address just two miles away. several of the suggested shops have WAY better prices than I can get locally. Like almost half off!