i used boots own brand. To be honest i wasnt that impressed with them. The windows on the sticks are not marked as to which is the test and which is the control so the result can be pretty confusing. i think they were around £15-£16 for a box of 5 tests. I couldnt be bothered with all the hassle to be honest, probably wont use them again, but i know some people find them pretty useful. Good luck!