Del’s is a Rhode Island icon if there ever was one. Available "at the sign of the lemon" at seasonal stands and from trucks (like the ice cream man, we have the Del’s man). They sometimes set up vendors at events and shopping areas, like the Wrentham Village Outlets in Wrentham, Mass. (right over the RI border).
Lots of luck. My Wife is at RI PBS (we met at WNET) and I’ll tell her to keep an eye out for the show.