There are 3 pins in the range - the standard shard pin and one pin each showing Wenlock and Mandeville. Mandeville's pin has the date 11/02/2012 as this is 200 days until the Paralympics.
No sooner are they announced, then one pin is out of stock. Yes, all of the Wenlock pins have been pre-ordered by retailers, so that means there are no more pins available to your favourite retailer once their initial allocation is sold. You may want to pre-order as soon as you can for this pin. Remember too, that previous countdown pins have been withdrawn form sale, so there is no telling how long this pin will remain on sale.
Each pin is limited to 2,012 pieces and the price of each will be £7