So I found this really helpful Google Doc with a list of amps for all classes and locations where you can acquire them. If this is stuff you would rather discover on your own then Spoiler Alert.
https://docs.google.com/spreadsheet...DVSdVE0NG5DSjNrLXhYMXdTQ2c&toomany=true#gid=0
https://docs.google.com/spreadsheet...DVSdVE0NG5DSjNrLXhYMXdTQ2c&toomany=true#gid=0