Set up a free website like this. Copy and paste your voice over scripts here. Get a few volunteers on Teamspeak and send a link to this site. Turn on the Teamspeak recorder and record in real time allowing for coaching and error correction if needed. No need to email scripts, no need for voice actors to set up a session on their own software, no need for them to email them back, no need for repeats to correct errors. This would also assure a consistent sound quality, all in a matter of a few minutes.