Hi Bubbles
I have used Clearblue OPK which I have to be fantastic. It gives you a little smiley face if possitive which gives me a bit of a kick! lol Its a digital one so costs abit more at about $80 from chemist and has 7 testing sticks so a week per pack. You can get other cheaper brands from supermarkets, but I personally never got the hang of them.
Have also used a saliva test regularly which is also great.

Good luck!
xo