JPG40504 wrote: If those 'two planers' consist of a jointer and a thickness planer, then that makes it even more so 'the one'.
On the other hand, if the sale somehow includes two planers, you should STILL definitely get that one. The planer is a great attachment, and one of the more expensive add-ons. If you're savvy, you could pre-factor your eventual resale price of planer #2 into your purchase estimate. Assuming both are working, etc.
But JPG's point is probably what the seller actually means.