If you are trying to get pregnant:
Clearblue are supplying a fertility monitor and 6 months worth of test sticks to go with it. Also a pregnancy tests, one per cycle. If you get pregnant while on the trial you will get £60 in high street vouchers
In return you have to collect an urine sample every day (they provide the sample containers) then send them away every 2 weeks probably. Also you keep a diary with an info about your cycle and monitor readings, they provide that too.
There is a pop up window on their website that has a link to a form that you have to enter your details in to. They will call you back to find out if you are a suitable candidate.
It is not a freebie or a deal as such, so I am not sure where to post it.
Just to add that the urine sample containers have a preservative in them and are sealed very well, so no smell. Also the diary is basically a printed sheets of paper where you record your monitor readings and any medication that you took, like paracetamol, etc so.