This may be a correct sentence, but it is very strange. The only way I can see how it would ever be used is as an answer to a question. Better wording would be "show them the best offers and deals." If you are looking for the use of "get to know" , it is usually used with a person or people, like "You should really get to know him, he's a nice guy. " or "You need to get to know your professor better, he's actually really funny." I hope this helps. If you are trying to convey a different meaning, please respond and I will try to reply.

"Let people know..." is more common.

The expression is possible but your example isn’t the best. I want her to know how much she hurt me. I want to get her to know how much she hurt me.(I not only want her to know, but I want to take steps to make sure that she knows) My students are so unmotivated. How can I get them to know that doing well in school can benefit them for the rest of their lives?