Offer up is a great app.
It works like Craigslist.
I sold my Bose compact that way. Lots of hits.
It has a built in messaging app.
No need to give out your phone number or e-mail.
Craigslist is great too. Sold many keyboards that way.
Good luck
Eric
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Genos, PSR-S970, TC Helicon VoiceLive3, Mackie 802-VLZ3 Mixer, 2 Bose L1 Pro16, Electro-Voice ZXA1 Subwoofer