No expiration date listed on the website, appears to be nationwide(ish). I tried several FS North Island stores and it was $1.89 at all of them. Currently Pak n Save Rangiora is the only FS South …
Saw these in one of the local PAK'n'SAVE and found that the other local PAK'n'SAVE also has the same deal. Doesn't look like all the PAK'n'SAVEs around the country …