i think the
Push Cart on the
Wolfeboro Town Docks ..summer..is
Sabretts. 
I have been looking for this stuff on line for years...to buy on my own..for home consumption...not commercial. The result was:..Sabretts is ONLY Available to the
"Push Cart Vendors"..... Sabretts actually SELLS the
Push Carts themselves..The Hardware.
Good News: My local market now sells the Sabretts hot dogs and sauce. Tried them both tonight. GOOD.
NB