Where to get the strips for the first fertility monitors

hello, am looking for a bit of help,i bought the clear blue fertility monitor (not the advance one) a few months ago and i cannot get the test strips for it av tried boot,superdrug all suppermarkerts and my mum also works in a pharmacy and she has check with all there suppliers and still no luck.i paid alot of money for this machine and would really appreciate it if you could help me out on where i could get these strips.