The Hut are selling "Tomb Raider: Anniversary" for the Nintendo Wii for £14.93 and for the Sony PSP for £9.93 (inc Del.).
You can get cashback through the usual sites (e.g. 5% Quidco)
The next bext prices seem to be £16.95 for the Wii version (BlahDVD) and £11.99 for the PSP version (PowerPlay Direct)