Figured I may as well make my own thread for the legit way to get an
additional 3GB of Dropbox space that is not time limited.
Just use the Camera Upload and get 3GB of space for uploading 2.5GB worth of
pictures. I did this about a month ago when it was in beta and got an
additional 5GB of space on my account. The additional space does not have a
time limit on it either.
Link: https://www.dropbox.com/help/287