Yes, you can find the option to add your own products within your account. Simply go to
Settings --> Labs & Products --> Your own products
Any product you add here can later be added to any price profile. Please note that it will be shown in the product category you select upon creating the product.
After a customer orders one of your own products, you will receive an email with the order details. You may also view the order in order management within your account.
Please note that for all 'own production' items, you are responsible for production and shipping and thus for the successful order completion.