You could do what I did
This is going to sound crazy - basically because my problem wasn't getting pregnant, but staying pregnant, but all the same, we did this.
I can't recall exactly where I got the number from (think it was someone on babyworld) and basically, it's the Clearblue "testing team" and what you do is you tell them that you've been trying to conceive unsuccessfully for 6 months (min) and that you've been keeping a diary and ask if you can test their ovulation devices.
They in turn send you a box.
the box contains
a clear blue ovulation monitor
clear blue ovulation sticks
a plastic jug
a colour in the dot A4 paper diary type thing (that you complete corresponding to the result on the monitor)
some clear blue pregnancy tests
some supplementary information
They send out a three month supply
What you do
First, you have to calibrate the ovulation monitor. Do this exactly as the information tells you to. Do not be tempted to turn on the monitor to make sure the batteries work when you're mid-cycle before you're going to start testing - cos you'll fuck up the equipment. It has to be done exactly to test criteria. As I recall you turn on the monitor the day AFTER your period starts and calibrate it.
Basically - you wake up every morning, you wee in the jug, you dip the ovulation test stick in the jug for a set amount of seconds then you put the stick into the monitor for it to "read" the result. This part takes a few minutes (so brush your teeth, take a shower - whatever).
Once the results are available on the monitor, record it exactly onto the sheet provided.
Do this every day.
The monitor isn't always perfect on the first month because it is "learning" about you, but from month 2 onwards - it's perfect. The monitor will have little symbols on it which tell you exactly when is productive and non-productive times of your cycle.
When you get pregnant, You send your box with all your stuff in it back to Unipath and they will contact you about 9 months later to ask how the pregnancy went, to establish the exactly length of your pregnancy and some general questions for resource purposes (i,e, did you have pre-eclampsia, was it a caesarrian birth - that kind of thing as they do research for other pregancy/birth type things to help fund their researching).
I used it with the pregnancy I had after my daughter (that ended in miscarriage) and again with the pregnancy where I had my son (I conceived on my first attempt, my period was the date that Madeleine McCann was abducted, I'll always remember that very well because I remember going to bed feeling shit when I started bleeding and watching the news breaking about her being missing.) .....
Anyway - Unipath's number is 01234 835000 (you'll have to ask for Clearblue ovulation testing). If nothing else, it'll save you over £100 in buying the equipment that you'll only ever use for a very short time.
Good luck