Strictly Fish in Lakewood (Carson/Studebaker) has some for about $29 and The Reef in Anaheim (State College and La Palma, just off the 91) usually has it for $20. $29 is probably cheaper than buying it online and having it shipped. Call around I keep finding it in LFS.
Watch out for the contaminated bags, don't buy it unless the liquid is clear, not milky looking. There are several threads going on about this right now. I know I am really disappointed to have to wait on setting up my tank because I bought some contaminated eco.