Last year I needed a remote for my car door locks.  I had bought the pickup truck used and it only came with one remote.
I saw a listing on eBay showing all kinds of remotes for cars and trucks.  I found the one for my make and model.  The picture in the ad looked like a brand new remote.  It looked exactly like the one I got with the truck.  I purchased the remote from the seller with the "Buy-It-Now"  feature and paid instantly through Paypal.  $26.50 for two remotes.
The postage was $11.00.
A grand total of $37.50 for two remotes that cost over $60 each at the local Chevy Dealer.  Sounds like a great deal. RIGHT?
WRONG!.  A week later the two remotes showed up in the mail.  In a bubble envelope with a $0.55 stamp on it.
I opened the envelope and out came two remotes so badly worn that you couldn't see the symbols for which button did what.
I emailed the seller and complained.  His response was " next time read the entire description, it says used"
I said these don't even look like the picture and one is for a car because it has a "trunk" button on it.
These were suppose to be for a Chevy pickup.  He replied "thats a file photo".  " Next time read the fine print".  I asked why he charged $11.00 to ship an item in an envelope for fifty-five cents.  His answer was," my time is worth something".  I was furious.
I reported him to eBay and finally got a refund of $26.50 minus the original $11.00 and a  $0.55 stamp it cost to mail them back.
He left me negative feedback, in all capital letters, calling me a liar and a scam artist.
My new rule:
If the description uses more words to explain all the legal details of paying, refunds and threatening with negative feedback, than it does actually describing the item, don't buy it.  You are going to get ripped off.