Depends on how far you want to drive and where you're starting. Assuming you're a standard Angelino and freeways aren't a problem, I'd start at Recon1. It's a surplus store and they're located on Ventura Blvd in the San Fernando Valley and have a huge selection of production stuff as well as some customs. They're not far from teh 404/101 interchange and have everything from Spyderco, Benchmade,, AL Mar, etc. They're set up to automatically get a couple of each Benchmade limited edition that comes out, so you can find some pretty rare higher end production stuff. You'll also find stuff like Chris Reeves and William Henry high end production stuff as well as Pat Crawford and Alan Elishewitz originals. Maybe even some Bud Neely. I've even seen original Al Polkowski knives there. You never know what they'll have. Ask for Gary or Sako. Sometimes they can even get a little friendlier when green money is invloved instead of credit cards. Depends on how friendly you are.
There's also the Shaver Shop on Wilshire Blvd in Santa Monica and the Supply Sargent on Lincoln just around the corner. Haven't bought from either, but both had a reasonable production selection, although not like Recon 1.
If you're near the Lakewood Mall, there's a shop called Advanced Cutlery that does some Benchmade, an occasional Willliam Henry or Chris Reeve, as well as lots of CRKT and the like, but they're mall based and pretty much retail price only.
If you want to wander a little further from home and cross the Orange Curtin, Plaza Cutlery in the South Coast plaza is one of the finer knife shops you could ever hope to walk in to. It's a multi generation cutlery shop that not only features a great selection of production stuff, but also customs as well as some true art knives. I've seen some John W. Smith and Koji Hara stuff there that made me want to be really naughty with my credit cards. They also host a serious show every other year and are often at Blade West with a table. Dan Delavan is a nice guy and a pleasure to do business with.
While on the subject of wandering further from home, but in the opposite direction, you could also go north to Nordic knives in Solvang. Like Palza Cutlery, Nordic knives does a lot of production stuff, but the beauty of the store is their collection of customs (which are for sale). Almost half the store is dedicated to customs and limited high end production like Chris Reeve. Solvang is such a cool day trip from Los Angeles, it's worth the drive up the coast and a Saturday just to look. They also sponser a show which is coming up at the end of April and is unusual in that they only invite custom makers, no factory stuff. The show runs April 23, 24 & 25 and you can count on finding me there on Saturday the 24th..

The area is surrounded by some well know wineries and it's worth considering as a nice weekend get away with that special someone (like my wife who bought me an original Hibben there last year!).
I hope that's a decent starter list for you. I'd love to learn about some others close by if anyone has some other ideas.
John