If you follow @myriad*seller's advice and open an Item Not Received case you ought to get your money back pretty quickly, although if you paid for the item using a credit card it could take anything from a couple of days to as long as a fortnight for the money to show up as having been refunded. However, given that the seller would appear to have had his or her account closed by eBay and has ended up been kicked off of the site, eBay are probably aware that there could potentially be problems with regards to refunds, and so ought to be on top of the matter. Therefore you should receive a full refund of your money pretty swiftly.
In the event that something goes wrong - for example, if you inadvertently allow the case to time out, although it takes thirty days to do so - then if you paid for the item via a credit or debit card your best option would be to start a chargeback. You have one hundred and twenty days from the date of purchase during which to do this, so if you do have to go down this route you should receive a total refund. Just make sure that you don't let the one hundred and twenty days expire if you do intend to pursue a refund using this method.
