Adorama.com has a refurbished deal on Nikon WU-1b wireless mobile adapter.
Refurbished Nikon WU-1b Wireless Mobile Adapter – $29.00 – at Adorama.com
The WU-1b is compatible with Nikon D600, D610, 1 AW1, 1J3, 1 V2, 1 S1. The price for new WU-1b is $54.00 at Amazon.com & B&H Photo Video.