So I dug around trying to find out about this and I probably overlooked it but I am going to take a chance and ask. Is there any rhyme or reason to the availability of certain cigars on here?? I am noticing some stuff just comes and goes but I wasn't sure if there was a science to it maybe listed somewhere by CBid themselves.

No if it's here its here and you won't know if they'll come back some things are a staple and some things like Tatuaje , Opus X, Illusione, come and go. Just have to be on the ball looking for the sticks you like and want. Use the search tool in the forum for I'm sure if you have a question it's been asked before.