eBay

I sold an item for $19.50 but the seller wants to pay $20. Why would they want to do this and is this a scam?

I'm selling an ipad and have gotten much higher bids than expected (~$270 for an item which is about $330 new) and am worried about getting scammed. How can I ship it safely in these strange times? Can I do signature required on USPS? I know I can in...