We always advise caution when pre-ordering games -- after all, you're buying sight unseen -- but Tesco Direct has you covered if you're seeking an early saving on the PS4 or Xbox One version. So long as you set up a new account, the TDX-HQ9T voucher code brings either new-gen edition down to under £40, a decent price for Ubisoft's anticipated open world hackathon. Thanks to zwortexx @ HUKD!
Be aware that serial key resellers have been offering substantially cheaper prices for the PC version, however, which will receive the timed-exclusive PlayStation DLC and is likely to run at a higher native resolution. Assuming your rig has what it takes.