Suzanne, had I known I could have picked it up for you when I went shopping out in Queens. Or, could have just taken the subway to the UWS and gone to one of the two kosher markets.
Thanks for the offer! It worked out okay after all. Besides the GF matzo meal, and margarine, I got some Ataulfo mangos!
ETA: As I reread the recipe, I realized that the procedure for making the bagel dough is basically the same as cream puff dough (pâte à choux)! It is a sad testament to my mother's Passover baking that her bagels were lead sinkers (like pretty much all her Passover cakes; at least those tasted pretty good).