NH, never heard of Maverick.Don’t know where you live. But out west in Idaho Utah and Washington. Maverick gas stations sell E-0 it’s about the same price as premium at 91 octane.
pure-gas.org showed a station but its 20 or more miles in a direction I rarely go. Come summer I will check on a local marina. Usually I don’t get more than a few years out of ope, either it rots or I find something better.