ONYX hotel group (including Amari, OZO, Oriental Residence, Shama, The Mosaic Collection) has started their flash sale on their site now. You can book 1 night and get next night free! This special promotion rate also included breakfast. Most ONYX hotels are located in Thailand. Rest of them located in Hong Kong, China, Doha, Sri Lanka and Bangladesh.
Booking Period: April 23 23:00 (GMT+7) – April 26
Travel Period: April 25 – September 30 (min.2 nights stay)
Discount code: 1free1
You can click the link below to access the promotion and view all participating hotels:
http://www.onyx-hospitality.com/1free1/
Or you can visit below promotion page for specific brands:
Amari: http://www.amari.com/1free1/
OZO: http://www.ozohotels.com/1free1/
Oriental-Residence: http://www.oriental-residence.com/1free1.aspx
Mosaic Collection：http://www.mosaic-collection.com/1free1/
How to Book?
Search hotel from above promotion page. You will see the rate of second night showing is “Free”. (See screenshot below). The rate of Oriental Residence Bangkok start from 6,800 THB for two nights. Most importantly, room type is “One Bedroom Suite” not Grand Deluxe. WOW.
Bangkok Amari Watergate rate from 3,802 THB for two nights including breakfast. 
OZO Chaweng Samui rate from 3,230 THB for 2 nights with breakfast.
My Conclusion
Free nights can be found easily during the travel period. ONYX is so generous doing this sale.
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