This is slightly beyond what an average layman can do, but it's not terribly hard or expensive to receive images of our globe from NOAA weather satellites [1]. Generally the most costly part is a ~$120 USD antenna. It's a super fun and rewarding project if this is the kind of thing that interests you.
The problem is that then you aren't verifying it yourself, and a flat earther can claim you're just using one of the propaganda sources created by the government.
You can also use the ESA earth observation program, which provides free downloads of earth observation data every ~5 days. Look for Sentinel-2. It still won't prove that earth is round though :).
[1] https://en.wikipedia.org/wiki/Geostationary_Operational_Envi...