Sound deadening suggestions?

Still working on setting up my home office and I am/was looking for options to reduce echo and noise in my office. Right now it is all hard surfaces so... plenty of room for improvement.

So far I’ve hung some fabric curtains and plan on getting a rug for under the desk. I also have some leftover egg crate foam I plan on mounting under the desks because.... well I don’t have anything else to do with it. Also going to put a white noise machine in the “common” area to help drown out common noise.

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I did buy some of this stuff off Amazon, but the foam didn’t expand fully and wasn’t actually 2" thick, so I spite returned them.

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That said, I have no idea what I’m doing, so any suggestions would be great!

Also if I went into an actual like... store... what kind would I go into and would they have this for not crazy high prices?  I’m not really wanting to spend more than $50.