For what it's worth.
If you do sell your headphones quickly, Paypal will hold your customer's payment for 21 days against your satisfactory performance. So ship within seven days, and preferably within 24 hours.
The HOLD is not applied to the purchase of shipping labels. So you can buy discounted postage through PP from your buyer's payment immediately.
If you are in a hurry for money, eBay is not the place.
