Surplus Sterling Silver Sheets

Hi - I some surplus sterling silver sheets (6" x 36" - .040" thick)
that I no longer need. Can anyone suggest where I could get the
best prices for this? One online vendor will buy sterling sheets.
Better to find a local private party or network through a school
like Revere Academy (I’m in the SF area)? Anyone have experience
with this? BTW, this sterling is 25-30 years old; does that make a
difference?

Thanks
Celtic Cat Designs