There are no new plots in New Orleans' oldest cemeteries, so the only way to get in is to buy one from another family. Unlike its older sibling, No. 1, Lafayette No. 2 is in terrible shape, but apparently there is still a secondary market in gravesites even here.
Interestingly, these above ground crypts can be the repository for dozens of burials over the years. Once the remains decay, and they do in short order in the New Orleans heat, they are simply pushed to the back of the crypt and room is made for a new body.