CDS Test strips

Trying to buy items in Newzealand is pretty hard being that the market is so small and businesses don't wish to import small items to sit on their shelves!! I have been trying to
obtain some Lamott Chlorine-Dioxide 0-500 testing strips and found only frustration which one can do without. Could any kind person living here and found a reliable source please let me know? Regards to all
jim