I think we may just buy two 2-packs so we'll have one extra.

I actually contacted eMed yesterday to ask if we could use one of the cheaper BinaxNow Self Tests we bought in the grocery store in the event there was a problem with our eMed Home Test during the middle of the video monitoring. My understanding is the tests are actually the same, and you're just paying extra for the person to watch you do it. Regardless, the eMed representative said that wouldn't be acceptable. Here's the response:

In order for you to be able to complete a test, you will always need to use every single item from the Home Test. Should there be an issue, what you can do is replace an item of a Home Test with that of another Home Test but not with a Self Test.