I am selling 5 used SongMeter SM4 audio recorders for $500 each (cost new is $849/recorder). I purchased them in 2016 and used them for 1 season (3 months). They are in excellent shape.
Product description:
https://www.wildlifeacoustics.com/products/song-meter-sm4
Contact Ariana La Porte for more information: ariana.laporte@gmail.com