I just want to give a warning to OP, because with this move you can lose your BTC.
Let's say you send me $1,000 in BTC to buy a guitar on eBay, I do the payment and send you a screenshot, then you send me the BTC. After that i call my bank and tell them that i see a payment that i never did, they will refund me the $1,000 and you will never get the guitar.
This is why this is a terrible idea and you need to be careful with a move like this one.
To avoid experiencing this, you can use reputed and active escrows
[1] and/or only trade to someone trusted in this forum. You can ask the people here to vouch that someone if you're in doubt. Of course, you will need to pay more since you will shoulder the escrow fee, this is for your safety.
[1]
https://bitcointalk.org/index.php?topic=2439910.0