A way to sell it directly off of your own websites without any inventory to carry is to publish through kunaki.com - they do all the order fulfillment and all you have to do is count the money (hopefully!)
from their website:
"Use the Kunaki publish-at-no-cost-to-you service. Our automated factory accepts credit-card orders on your behalf. We manufacture and ship your product to your customers within minutes. We report sales with customer names/addresses to you and send you a check each month for an amount equal to the quantity sold multiplied by the price you set."
"The paypal version of publish-at-no-cost-to-you service is identical to the regular publish-at-no-cost-to-you service but sales proceeds are credited to your paypal account instantly after each sale. This allows you to fully control your product's revenue."