Hiya, I bought some really cheapy stick ones from Home-health.co.uk as they are only £15 for 100 tests (and you can choose to mix them up with HPT's - whichever quantity of each you want).
The first month I used them, I used them along side CB ones (the pack of 7) so that I could definitely tell when I was getting a -ve or +ve result. So for they seem to be working really well for me.
Good luck xxx