Tech and Hunter in “Unfinished Business”

All clones were created from a host named Jango Fett. While our genetic structure was modified for growth acceleration and obedience, Omega is a pure genetic replication.

How many clones like that exist?

To my knowledge, there's only one other. A male clone code-named Alpha, later referred to as Boba. Since he disappeared at the start of the war, that makes Omega the sole living source of Fett's raw genetic material.