Zavvi are currently taking pre-orders for Bioshock 2 on PC, Xbox 360 and PS3, and you can get the first Bioshock for £9.95 (usual price £12.95). This also includes the BioShock 2 Collecter's Edition.
Prices for BioShock 2:
Xbox 360 and PS3 - £36.95 (Collecter's edition £69.95)
PC - £27.95 )Collecter's Edition £54.95)
Your friendly neighbourhood hobo.