I don't know the what the pillows cost in other store but yours seem to be priced right.
I use a simple pricing formula, but that is paired with market research. Also you should decide if you want to down down market (dollar stores), down market(target), mid market(department stores), pre-up market((coach), true luxury(LV,goyard)and super premium/ high luxury market(Hermes/Bergdorf Goodman). I want to be true luxury. But i am just starting out so my prices are on the low end of true luxury..
So that sets you price also. If you want to be downmarket, your prices are a little high, if you want to mid market, your prices are perfect. If you want to be true luxury your prices are very low. If you want to be super premium/high luxury your prices are way, way, too low because pillows from high luxury sellers start at 400$ and go up from there.
As you go from down down market all the way up to high luxury you will make less sales but more profit per item.
I know this is a very long and complicated answer but with some kinds of items where you want to be in the market should have a huge impact on how you price. Pillows are definitely one of those kinds of items because they run from 10$ past the 1000$ price point. and both the 10$ and the $1000 can easily be priced right for what they are.
So for you it should be your costs and materials and profit plus where in the market you want be. For most people where you want to be in the market I also how much work goes into each item. The more work the higher in the market you are.