I am considering selling my phantom 2 vision plus with prop gaurds and lg case that hold the rdrone with prop gaurds attached.

I see alot of low prices on a new phantom 3.
wondering what a fair price might be for the 2 vision plus.

I have only used it about 3 times.

As the owner of four older model Phantoms I can tell you you're going to be disappointed.  Check ebay -- there is a checkbox on the left side for "completed listings" so you can  get an idea of what they're going for.