You can look on Ebay for the occasional 110 Verichrome Pan 12 exp roll... There's a couple there now.
While some later-generation 110 cameras could tell the film speed from notches, the first generation were naturally set to ASA 100. The Model 20 that I started out with had two speeds, slow speed enabled by using a flash. I used to keep matchsticks in my pocket to take advantage of this fact on cloudy/overcast days.
(So, it IS an adjustable camera).