Great basic mobile with a long battery life. I was looking for cheap unlocked phones to use abroad (using a foreign SIM) and this is ideal. Offer is instore and online. Virgin and Vodaphone networks are available at this price, other networks cost more (click the "view deals" button for details.
This is instore and online. Don't forget quidco if you buy online (£5 off PAYG).
I bought a couple instore and was given the SIM packs separately having decided which one I wanted for each phone.