The best place to get jeans is the Warehouse Sale, which travels around the country offering brand-name jeans for cheap, including True Religion, Genetic, Hudson, Chip & Pepper, Joe’s, and many more.
Their next sale in LA is on March 29, 2009. Visit http://www.thewarehousesale.com to register. It’s free to get into the sale as long as you register ahead of time. (Also, I highly recommend getting there early and waiting in line.)