I dont really know when their going to release it on dvd on wikipedia it says
DVD Release Date
TBA
plus that
DVD Release
MTV and Amazon.com have struck a deal to produce DVDs for some MTV shows, through the CreateSpace service. Using a concept similar to print on demand, amazonas, amazon will be making the discs, cover art, and disc art themselves. The first season of The City will be released soon on Amazon's website.[3]
link to the amazonas, amazon page selling it as a preorder
link with a pre order price guarentee