Good old Shopto, cheapest by a big margin.
As for the game, is it me, or does this release seem a bit pointless? If it was a 360 port that would be understandable (and great), but it seems you get the exact same stuff as the original game on the original platform it was released on, except for a couple of Vr missions which I'm guessing hardly anyone will play. Great for people who haven't got the game already to be able to pick this game up cheap, but for the majority of Ps3 owners who've played it or still own it it seems pointless.
Oh, and my copy of Mgs4 already has a slip case!
Own...360(Slim), Ps4, Ps3(SuperSlim), Ps2, Ps1, PsVita, XperiaPlay, Gamecube, Snes, Dreamcast, Megadrive, MegaCd 2, Saturn, Gamegear, PC
Owned...Acorn Electron, Atari 2600, Gameboy, Master System, 32x, GBA SP, Xbox, Psp, 360(Premium), Ps3(BC), Wii(BC)