This prompted me to re-order my 20lb bag of green beans early this year.
Looking back at my order history the price has been the same ($129) for the past four years, but now is $134. Not exactly a steep rise, but more than zero.
They usually only 'go bad' in that they tend to lose flavor and punchiness over time for most home storage. For warehouse storage in jute bags, they tend to get a 'baggy' flavor eventually which is unpleasant.