Quoted from OLDPINGUY:Many bulbs, with feet on the ground in China, have a 20%-50% markup here after import, so after all expenses and taxes, (6% shipping, 2.75% CC. Free shipping 3.3%, Cost of inventory, 10%, Labor cost 8%-12%, Operating costs, and taxes....About $.03 a bulb left for profit on the low end bulbs.
Art
Just to add to this...stated shipping is off by a factor of 10x. Shipping typically adds about 60%. Then there's brokerage fees for large freight orders -- even duty free stuff requires a broker to 'push' the shipment through customs by providing proper commodity codes, etc.