I assume OP missed the u prefix on the second unit.
That said I am not qualified to tell if a >1uCi source is safe to handle or if so where one could get one.
Radioactive sources up to several uCi are quite common in labs that work with nuclear detectors. They are used to make sure detectors are working, as well as providing calibration of energy and efficiency.
If sealed, as a Gamma source can be with no trouble, they are pretty safe to handle. Alpha, Beta and fission sources need to be more "open" to avoid absorbing the particles, and are thus more
easy to damage and lose some of the radioactive material. Therefore, you have to handle them very carefully.
All of these things generally require an NRC license to possess. The only things I can think of that you can legally have are the Americium sources in a smoke alarm and pieces of Corelle and similar glazed ceramic plates. I know the level of protection we need to provide here. Safes with 5-number combinations, locked doors, monthly inspections to verify the sources are still here, lead "pigs" and other shielding when carrying sources from room to room, having our rad safety people move a source even to a building across the street, and on and on. And, these are uCi - level sources, not whole Ci level stuff!
Jon
Jon