Steel Box Tubing Wanted: (Southern California)

Wanted: Steel Square Box Tubing, 10" x 10" up to 16" x 16", 1/8" to 1/4" thick.
I can use different size lengths, rectangular similar sizes also wanted.
The steel can be remnants, cut off's or scrap, light rust is ok.
,call if you have reasonably priced remnant steel.
If you know of a sales yard that sells short pieces of steel would you please let me know about their location.
Phone call's are best for me.