I make travel pillows too, always on the lookout for kid's size pillows in good condition, I make the removable covers and I cover them in fleece. I charge $4 for them. I think $3 is a little low, and $5 seemed a little high, $4 seemed to have just the right "psychology" to it.
At a quilt show recently they had a country store and the quilts were marked between $25-$30. I thought that was very reasonable.