I brought mine from woolies. Only went to 1 digital point, but hit the jack pot on 2nd month. It was a baby section. I did order one from chemist, was very strong on wanting a 2 decimal one, the guy assured me it was, even said on the box that it was a basal temp therm thing, cost me $30, but only had 1 decimal place as well.
All charting info, i got of the net, and then made my own chart up.