Hey everyone,
Check this link on Newegg, Obi 200 (Polycom) with promo code EMCTAVD65 $39.99.
https://www.newegg.com/polycom-2200-4952-001-accessories/p/N82E16833617015?Item=N82E16833617015&utm_medium=Email&utm_source=IGNEFL052819&cm_mmc=EMC-IGNEFL052819-_-EMC-052819-Index-_-VoIP-_-33617015-S3A1A
Get them while they last keep a spare around 1 per customer!