Hood deflectors appear to be available at Nissan dealers in Canada but not at US dealerships. This appears to be a Nissan Canada only accessory produced by a mfg in Canada.
There is a similar thread in the Versa forum:
zerothread/297888
Assuming the process is the same, there are only 2 ways to get one of these deflectors:
1) Purchase directly from a Canadian Nissan dealer in person or with the assistance of a friend (perhaps one of our canadian forum members), have them purchase one for you and ship to the US.
2) Try to special order one from a US dealer. Assuming it's made by the same mfg: Focus Auto Design in Calgary, Alberta, Canada.