The kosher-for-passover stuff is only available in the weeks leading up to passover, and I've only really seen it in areas where there are large Orthodox communities.
I do have some friends who will stockpile it for a year so that they don't have o drink the 'swill' that the rest of us enjoy.
I live in NM and it's one of the few KfP products I can get fairly easily. The folks around here are so incompetent at Jewish matters they tend to either have nothing or stock KfP stuff year round. No significant Orthodox community in the state.
I do have some friends who will stockpile it for a year so that they don't have o drink the 'swill' that the rest of us enjoy.