If you would consider importing from Europe there are several being advertised
https://www.theparking-motorcycle.eu/#!/used-motorcycles/Moto-Guzzi-Tenni.html
theparking.com searches many (most?) motor vehicle sales sites on both sides of the Atlantic.
Not every seller names the model of their bike correctly, a few more can be found by browsing the hits for "Moto Guzzi Le Mans", "Moto Guzzi V11", and "Moto Guzzi 1100".
Best of luck!