A great source for stereo pairs is NOAA's aerial imagery data, consisting of various snapshots along an airplane's trajectory. For example here is a stereo pair of Desecheo Island:

https://cdn.coastalscience.noaa.gov/datasets/aerialphotodb/u...

https://cdn.coastalscience.noaa.gov/datasets/aerialphotodb/u...

EDIT it can be tedious to discover such pairs. If only there were a tool...