You should also look for rat rescues in your area. Although some of their rats may be skittish and need work, rescues are generally very up front about these facts, and try to pair owners with the types of rats they want. Our rescues here have tons of well socialized baby rats from accident pet store litters.
We are as gods to the beasts of the fields. We order the time o' their birth and the time o' their death. Between times, we ha' a duty. - Terry Pratchett.
"Men have forgotten this truth", said the fox, "But you must not forget it. You become responsible, forever, for what you have tamed. - Antoine de Saint-Exupéry