Hello my friend,
A 16" rim, especially steel, is not an item made especially for the Leaf. The leaf is designed from the Versa, and I am sure that any steel 16" Nissan rim (with the same width) will fit... Also, the bolt holes are the same for Hondas, Toyotas, and possibly others.
I would go to a tire show and get a price for a new steel rim. GET THE CORRECT size dimensions. If you do not like the price, then go to a junk yard, and I am sure that you can find dozens of rims that will work on the leaf...