searching for RI-TRP-DR2B-30

  I am searching for RI-TRP-DR2B-30, actually i know this type has stop production,  my customer insist to choose RI-TRP-DR2B-30 but not its succedaneum RI-TRP-DR2B-40. So pls help find where to buy RI-TRP-DR2B-30, thanks a lot !