This is the unpredictable part of the website. You never know what you're going to get. Special offers might stay here for a month or two or they might be here only for a few days. They might be back again but they might not. It's a case of 'get it while it's here'.
There may be clearance items, or possibly seconds, but more often they will just be very special offers where for a limited period you can buy something for less than the usual price.
For information on how products are packaged and posted, please see the usual shop pages for that item, e.g. textiles, scarves, cards, etc.