There are many ways to identify a bad seller.

Always make sure the seller give the item location. Search for iPod mini and select lowest price. Most of the items on there do not include an accurate item location. You always want to know exactly where your item comes from so you can insure a good item.

Always make sure the price is decent. Look at the iPod mini search again and look at the prices. Some of them have regular price as $.01 and the Buy it Now price as $.99. Something like that is worth at least $50.

Good feedback is probably the most important aspect about a seller. If a seller has a 70% feedback rating or 10,000 negative feedbacks, don't buy from that seller. He will give you a bad product and you won't be able to get your money back.

Listen to these tips and you'll be a smart seller forever.