I Am Legend [Blu-ray] is available for preorder on Amazon.com for about £13 delivered ($18.95+pp).
It is REGION FREE & released in US on 18th March. UK version is about £18 preorder everywhere & isn't released until 21st April. Even taking into account 2 week shipping time, you should still receive it before the UK version comes out & for cheaper as well.
Amazon also has a 50% off Blu-Ray sale at the mo.http://www.amazon.com/gp/feature.html/ref=amb_link_6480972_1?ie=UTF8&plgroup=1&docId=1000205241&pf_rd_m=ATVPDKIKX0DER&pf_rd_s=right-1&pf_rd_r=0YRSWVF8FH4NHNT9K3VF&pf_rd_t=101&pf_rd_p=370881401&pf_rd_i=193640011
to check region code.
Also, I have found a way of avoiding paying customs fees when ordering from Amazon.com. If you tick the 'gift options' box before checkout, you can add a FREE gift note to yourself (don't add gift wrapping). This causes Amazon to mark your parcel as a gift.
The customs limit for 'gifts' is £36 as opposed to the usual £18 limit.
Now I know that 'gifts are supposed to be person to person (ie non-commercial), but in practice I find that I don't get charged customs fees anymore.
I import ALOT of US DVDs from Amazon.com & I used to get stung for customs charges EVERY single time. But for the last 2 years since I started adding the free gift notes, not a single custom charge, even for my US Buffy boxset which was £50+.
I think that as long as the package has 'gift' marked on it & it's not ridiculously over the limit, then Royal mail don't bother (probably have lots of agency staff who don't know ins & outs of customs rules & think gift means gift).
Anyway, if you want you can add some extra blu-rays from the 50% sale to your order which each extra blu-ray only adding about £1 or so to your shipping. I've added Cars ($20) & Fifth Element ($15) to my order.
If not, £13 for I Am Legend is a still a very good deal.
Sorry for length of post but on previous posts people are always worried about going over £18 limit, so thought I would share.