This source of Micra accessories has been mentioned in the forum. This is my ordering experience.
List of 2015 Micra accessories available from Albi Nissan de Blainville, QC:
http://www.nissanparts.ca/acce.php?y=2015&v=108
Why I ordered from them: Every time I called the parts department at my local Nissan dealership in Calgary I was quoted a different price for accessories, usually above the MSRP (for items that are overpriced already). Irritated by that experience, I ordered everything I wanted at the same time from nissanparts.ca so as to get free shipping at $500 plus. The accessories arrived in less than a week via Loomis ground shipping and I saved about 20% over my dealership's MSRP plus pricing.
I installed the cargo cover (which the S doesn't come with) and the below cargo "stowage box". Now I have to figure out how to install the hood deflector, window deflectors, and chrome rear bumper guard -- all of which involve precise measurements and warm, dry weather due to the adhesives involved. Wish me luck.