Advance Auto may be the only place- I’ve seen some commercials advertising that the DieHard brand is now at Advance (commercials starring Bruce Willis reprising his “John McClain” character form the Die Hard movies!)
But… know that the DieHard battery name was sold off as part of the liquidation of Sears. The manufacturer is most undoubtedly not the same as it was in your old DieHard battery- and even if it was, 16 years is an unheard of amount of time for a battery to last. You got a great one with that one!