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 Island store on the online ordering website and it has them for $1.99.
Cheap as for Coke Range and no limit is amazing. I got 32 bottles of Coke and a bunch of other range ones in store, I tried adding 500 bottles to my cart on the website and it let me..