Ebay 1099-K - Inventory vs Supplies

[goro10]

I am an individual, not business ebay seller - I sell mostly used stuff of whatever I can find which includes mix of personal items and stuff that I buy from classified ads, garage sales, etc...cash transactions. My gross income is less than $22K. I'm confused on how to properly report cost of goods sold. With Inventory option, it is very complicated since I can only guess cost of my inventory at the beginning or the end of the year. And what about inventory within that year since a few items I buy and resell right away? Can I just use Supplies category for cost of goods sold, or Inventory is a must?

[RobertB4444]

You can use the actual cost per item sold.  Each item that you sell you enter just the cost of that item and you do that for everything, in which case you show yourself as carrying no inventory.  But that means you can't take any deductions for anything that you have bought that is sitting on the shelf until you sell it.  Which is fine as a way to track expenses per sale.  

@goro10