What's in Scott's e-mail this morning?

Through March 31, Save 10% from Amazon.com on Select Carbon Monoxide Detectors.

Let's take this step-by-step.

1) Is there some sudden need for Carbon Monoxide Detectors?

2) Amazon SELLS these?

3) I can only save 10% on a few of them? Does that mean there's some high-end one that I'm going to have to shell out for?

The world's a mystery to me.