What I hear is you are arriving in Los Angeles on Sunday and you need to pick up a bike and other camping gear, so you thought flea market swap meet would be good.
If that is the case, and you wish to get up to Gerlach as quickly as possible, you might want to NOT go to Farfax high school, It will take you all day just to get in and get out of that area. If you are taking I5 to I80 to reno then Denio's might be a much quicker stop. Here is their web site.
http://www.denios.org/
Also there is the Saugus Swap meet, opens at 6:00am I think..
http://www.saugusspeedway.com/swapmeet.php
If what you are looking for is camping gear, walmart is good and I think there are some other options for getting used bikes if that is what you need.