Sleep is important. And part of getting a good night's sleep is having a good pillow. I think the folks over at The Company Store get it. Check out their pillow shopping guide. Depending on if you sleep on your back, or side or your stomach, your pillow needs are different. They even have a test to tell you when to know it's time for a new pillow:
Fluff your pillow well, then, fold it in half. If the down and feathers still retain their natural ability to loft, the pillow should unfold itself. If not, it might be time for a new pillow. Ultimately, the best test is comfort. If your down pillow is no longer soft and comfortable, it's time for a change.
The Company Store divides their pillows into good/better/best so there is something for every price range. They also sell great pillow protectors to protect your investment – get at least one for each pillow you buy.
Once a year they have a sale called the more you buy, the more you save. Essentially if you buy multiples of a pillow, the price is reduced per pillow. They make everything themselves, eliminating the middle man, so their prices are always good, but their sales are fantastic.
So if you aren't sleeping well these days, check that rectangular thing under your head. Maybe it is time for a change.