I bought some Wamsutta pillows from Bed Bath & Beyond ($70ish each)...maybe they were more and that was with a 20% off coupon...can't remember. We have maybe 4-5 of them total. They sell them for back sleepers and side sleepers that have different fill. I recommend going down or synthetic down...to me, poly-fill pillows are junk.
If you buy one pillow and then a few months later, buy another the cost isn't so bad to absorb. What's bad is not sleeping well since you spend so much time in bed. It's worth the investment as long as you choose wisely when you buy. All filled pillows feel like they're overfilled when you first buy them until they break-in. Remember that. They'll be more comfortable after a couple of months when they get compressed some.