A pretty great price indeed... well, if I could find the software that is haha.
Keep in mind that these are dollar store electronics we're talking about - they often get them surplus because they didn't sell somewhere else. Because of that I highly doubt that this device originally cost $2, since it doesn't seem like they could turn a profit selling it for that little.
Well, true, without the matching app there isn't much you can do with it. That said, even with the app the usefulness is limited. I have a smart watch that has such functions - counting the steps ect. - the question is only: why would I want to know that? :)