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Are you saying that you will be receiving two 1099-K forms?  One from ebay and one from paypal?

It sounds like you are reporting self-employment income for the IRS form 1099-K activity.  Or maybe there are two self-employment activities?  One from ebay and one from paypal?

In TurboTax Premium, you would establish one (or two?) self-employment activities under Federal / Wages & Income / Self-employment income and expense.  

If you ran your costs through Inventory, at year-end you would report the Cost of Sales for your product and may reflect a balance in unsold product Inventory.