Hi yacpro13! Did Eric or Thomas answer your question, and if so, would you mind marking one or both responses as a "Good Answer?" 
Otherwise, what questions do you still have?
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Hi yacpro13! Did Eric or Thomas answer your question, and if so, would you mind marking one or both responses as a "Good Answer?" 
Otherwise, what questions do you still have?
Hi Rosemary! There's actually a pretty decent explanation here: https://moz.com/learn/seo/schema-structured-data
Structured data is a system of pairing a name with a value that helps search engines categorize and index your content. Microdata is one form of structured data that works with HTML5. Schema.org is a project that provides a particular set of agreed-upon definitions for microdata tags.
Does that make sense? 
Out of curiosity, what CMS is your site on?
Hi Malika! How'd it go? Did everything work out? 
Thank you so much for following up, Katherine!
We really appreciate it.
Yeah, I'd have to say that a 404 would be far preferable. A 301 would be ideal, but it would take some bandwidth to redirect to the next-most-relevant page whenever a deal expires.