Question
Hello Greg,
 At one time time, my Grandmother had one of these plants. When it flowered, it was the most biggest flowers I have ever seen. That was back in the 1970's. I was wondering where I could get one of those plants. I have searched all over, but have come up empty handed. I live in New York, If that is a help. Thanks for your time and help.  

Answer
Stephen,

Sorry for the delay in getting back to you, I have been having a lot of computer issues that I think are now fixed. There are a number of "night blooming cereus" plants, however the most common and the easiest to grow is either Cereus hildmannianus or Trichocereus pachanoi. Both are readily available at nurseries or even Home Depot. Hope this helps.

Sincerely,

Greg