Unused Dining Dollars?

Seeking inputs on how to prolong the remaining value on one’s unused Dining Dollars (DD) before end of this month:
My S appears to still have quite some DD left (since he hardly used much at all this school year), and we know that unused DD will be forfeited at the end of this Winter term.

Are there any stores/restaurants on/near campus (or even online) that will allow us to buy gift-card with the remaining DD? If so, which ones? Any other creative way to reuse this at a later time? Thanks!

Perhaps the Starbucks in the Union…

Au Bon Pain in the union would probably let you buy a gift card with the m-card money, too