Good idea to buy one used - where do you think I should ask around here - the pregnancy board?
There is a CBFM thread around here somewhere, and I believe they list recent "graduates" (meaning women that got pregnant while using a fertility monitor). You could always ask there - if some of them are sure this is their last planned child they may be willing to sell. I think I even saw they had super helpful instructions posted there for clearing the data when you buy a used one.
I just got my bfp without the use of it. Only used it 2 months and gave up on it because it didnt tell me anything i didnt already know. Anywho...I paid 99 on sale at longs and I will sell it to you for $30? Is that fair? I swear it works. I just dont need it and I would rather someone get it who can use it. I know the pain of month after month BFN!!!