It might help if you can say what types are needed - old, young, male, female, British, American, etc. I don't know how many animator here also do voices.
There are some good voice actors at Fiverr ( https://www.fiverr.com ) and other online sites. The majority tend to do advertising voiceover type demos, but there are some who are more into character acting. They do charge money, but most are very reasonable. I was looking there because I will need a male who can do a Texas accent for a project, and since I live in Australia there aren't any around here.
Ok sure well I mean if I have to pay people I don't think I'll go that far :D But if you have heard of a Youtuber named Edbound he said he might be able to help me with this newest project!