Recently I was feeling a bit "down" about my tooth that needed a dental implant, so I ordered an expensive pillow from Amazon as a form of retail therapy:
https://www.amazon.com/gp/product/B00EINBSEW/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
I love it, and can't imagine any pillow being more comfortable than this one (for me, YMMV). It is firm enough to support my head up high enough that I don't get pain in my neck or upper arm, even though I'm a side sleeper. And yet, it is also soft enough that I feel like I am sleeping on clouds and sleeping much more soundly than before.
Bear in mind that my basis for comparison is terrible, because this replaces cheap pillows that I bought over 15 years ago at a discount store. But still.