If you’re booking an Economy class return Emirates flight from the USA, you can currently get $50 off by using the code USSWBLU.
The discount is only available to Emirates Skywards members, but you can join for free here.
Crucially, you need to book by the end of 16 November (i.e. tomorrow), and travel between 25 December, 2014 and 31 May, 2015 (although inbound travel is not permitted between 1 and 12 January, 2015).
(Sourced from bluepromocode.)