This is a link to Bill Mounce's online classes including New Testament Greek. There is a free version along with a paid version
This is a link to the Omniglot website Greek Alphabet page. It contains serveral recordings of the Greek alphabet using different pronunciation schemes.
A listing of recordings of New Testament books in Greek from the Lets Read Greek Website; along with a description of the recording including what pronunciation scheme is used.
A YouTube playlist of the Koine Greek New Testament books read by a native Greek speaker using modern pronunciation.
YaSas.com is a Greek culture website that includes introductory audio lessons for the Greek language.