If the item is eligible then the full purchase price should be covered according to the FAQ:
How much of my purchase is covered?
If we agree your purchase is eligible, we'll reimburse you via PayPal (as described above), for the full purchase price of the item (including any applicable sales tax) plus original shipping costs. If you're opening a case because the item doesn't match the description, you'll typically need to pay for return shipping.
I just had to file a dispute with a seller for a lot I purchased for like $1289. Hopefully I can get my money back or actually get the item.