I just replied to another post with this information, but I wanted to make sure that you ladies got this information since a lot of us buy/use Wondfos. HTH! And BTW, some ladies on FF were able to get either refunds or a free order of HPTs from the distributors off of Amazon due to the bad batch.
There is a bad batch of Wondfo's with the expiration date of 06/2013. The information came up from several posters on the FF Trying to Conceive Forum the past couple of weeks. One of the ladies over there actually contacted Amazon and Wondfo and received confirmation that a bad batch had been distributed. I'll see if I can find the info over there and then I'll update this post...
EDIT: Found it! Here's the link to the post, but you'll need to login to FF to access the forums first. In case this link doesn't work the same way as TB post links do, I've added the bad batch information below:
lot #W0110632-3 Expiration 06/2013
~Sweet Girl *8/18/08* c-section ~ Sweet Boy *12/2/10* VBAC ~ Sweet Boy *8/14/12* VBAC~