If 'no flats' is a primary objective = Schwalbe Marathon series. Several tread designs for the size you need. Not a sublime ride (my preference) but drop the pressure a bit and it's not an issue, given the primary objective. I run them on my tandem in 32mm. On occasion with 380lbs of humans + gear.
E-Bike, Touring & Road Bike Tires | Schwalbe Tires NA
I scrolled and the 'original' Marathon road tire - not the Marathon Plus models - sells for $43. Maybe deals out there, IDK.
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Vintage, modern, e-road. It is a big cycling universe.
Last edited by Wildwood; 04-10-22 at 06:57 PM.