Modern Vespa

Tour of name brand gas stations, Shell, Chevron, Texaco, & Exxon did not yield any premium non ethanol gas. And all their pumps were one hose pumps so you get a hose full of whatever was pumped before you. Not too bothersome for a 20 gallon fill up in your car. But significant for a 1 1/2 gallon scoot fill up.
Then I stopped at Walmart Super center. Their pumps are multi hose and they have non ethanol premium dispensed from its own hose!

OFG

https://www.pure-gas.org/
This is user updated, so some of them are closed. Some are wrong. Some are not listed. But many people try to keep it up to date as possible

Does your Owner's manual specify non-ethanol?

You should be able to burn E-10 91 octane without a problem.

Ethanol is typically a concern at higher concentrations or in older engines with rubber and plastic parts not formulated for it.

Or if your scooter is going to be put away and not ridden for a few months.

It's been batted around on another thread already. It's his personal preference, that's all.

Back in the dark ages when I was pumping gas for $0.29 a gallon no-lead was the new thing and ethanol came from the liquor store. There are many who have no problem with E10 fuel but I am not in that population, so will buy E0-91+ when I can find it.

OFG

In Switzerland 100 octane free ethanol 🇨🇭💪

You may consider to make your own ethanol-free gasoline by washing out the ethanol with water.
It is not difficult. The principle is based on the fact that ethanol is hygroscopic and easily dissolves in water while gasoline does not. The water-ethanol mixture has a higher density than gasoline so it will sink to the bottom.
One example how to: The blue dye is not necessary, it is only there to make the 2 layers more distinct.
Also mind that ethanol-free gasoline made from E5 or E10 has a lower octane rating, since adding ethanol to the fuel increases the octane rating. The tip to increase the octane rating can be useful.

I did not try it myself. My BV is suited for E10 and I always simply fill up with E10. No problems whatsoever after now some 19k km.

European and US octane ratings are not directly comparable.