If you already have season 1 or 2 this is a pretty good price. Otherwise get the box set of all 3 seasons.
I've been waiting for Season 3 of Deadwood to drop in price and it has done so in the last few days to £10.93. Combine this with the bank holiday voucher code of BANK10 and you can get it for under a tenner.
Season 2 is this price also.
Excellent tv show that is up there with The Wire IMO