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After choosing your dates, click "Send Inquiry" instead of "Book now" and mention the deal.
From the original post…
Limited time deal! Mention Facebook in your inquiry and receive $ 50 off a two night stay and $ 100 off a three night stay at Boulder Summit Joshua Tree.
https://www.Airbnb.com/h/bouldersummitjo
Offer valid on bookings made on or before September 27, 2021 10:00 PM PST for any stay that starts before December 31, 2021.