Then I found etsy seller dearharbor. She has the loveliest sand dollar sachets, stuffed with lavender, perfect for a beachy-themed wedding or shower favor -- I love the buttons and stitching. 18.00 dollars for a set of three, ranging from 4.5" to 5.5" in diameter.
She also makes starfish sachet pillows
15.00 dollars for one, about 10" in diameter: