This pillow right here. You can smush it into different shapes and it mostly stays. I’ve made a little crater in the middle for my back sleeping, then I can roll onto the taller ends when I sleep on my side.
100 seems like a lot for just a pillow. However, you use it every night and it helps you waking up without back or neck pain. So, investing 100 dollars into something you use 1/3 of every day seems like it's basically nothing. My pillow costed almost 200 euros, my matrass was 1800. I've had it for 10 years, so it costed me 2000/3650= ~0.548 per night, 7 to 8 hours per day. Almost 55 cents for proper back and neck support, so I don't wake up stiff and sour. The longer I use it, the cheaper it becomes, but I think in a year or two I'll buy a new set so I'll be sleeping like a princess for another 10 to 12 years.
Plot twist: learning to sleep without a pillow is even better for your back and neck. So, there's your cheap option.
You don't need to pay quite that much to get one, but investing in a nice, expensive pillow really upgraded my sleep quality dramatically. I won't even let my houseguests use cheap pillows anymore. The difference is just too dramatic.
Can’t speak to the Birch comforter’s quality, but recently I got my first set of really nice sheets too. If you’re patient, you can find some Frette sheets for surprisingly cheap on one of their sales.
High quality sheets are one of those great luxuries that isn't remotely necessary but is so, so nice to have. Especially on a hot summer night. In my experience, they don't last nearly as long as cheap sheets, but if you can afford them, it's worth it. I'll definitely check out Frette.