Toy Mandala is a really cool store but they have an extremely limited selection of 1/6th.
I like Blast from the Past quite a bit, they recently relocated into an old bank (the address in the article is correct but it looks like the store front picture is from their old place on Hollywood Way). Blast has a decent selection of Hot Toys, they used to have a lot of older Sideshow GIJoe and Star Wars but most of those were gone last time I was in there (I did get a Plo Kloon for original retail price though, not a bad figure for the day and at $59 is a great deal).
Things is definitely cool to browse but they have better deals on their website... I got two different Clone Commanders at over 50% off at their Comic-con booth and they have a great nick and dent section for comics (and once in a while toys) online.
Frank and Sons is a like a permanent ghetto comic convention. It is 45-60 min drive East of Los Angeles and is basically a warehouse with a bunch of different vendors. They have special events there too, Katie Segal and some of the other cast of Sons of Anarchy were there the last time I went but she wanted $100 for anything basically.
I have never been to Halo13 but I saw them at a 1/6th scale convention at Frank and Sons once and they had a decent selection - 90% Hot Toys and anything old was super marked up.
Golden Apple on Melrose has a few 1/6th figures - usually Marvel or DC, they have had Rocket Raccoon forever for about $160.
Legacy Comics in Glendale had Robocop last time I was in there and were selling the original SSC Darth Maul for $280!
There are a few more that have the occasional 1/6th but not sure if they still have any in stock... Dreamworld Comics in Marina Del Rey for example had a bunch of Hasbro 12" stuff and a few old SSC figures on consignment.