What's the value of?...

[The Ominous]

Hello can someone tell me the value of the following:

Final Fantasy VII Advent Children Advent Pieces: Limited (NEW)

Mass Effect Limited Edition (PAL) or (NTSC) BOTH NEW little imperfections
(is one more valuable than another?)

Crysis 2 Nano Edition steelbook(PAL) Opened

The Art of Darksiders Signed by the author, Joe Maureira

Street Fighter 2 HD Remix Press Kit Sealed (NOT MINT)

Bioshock 2 Special Edition hardcover guide opened with no lithographs.
(is there any demand for this?)

Forgot to add: Metal Gear Solid HD Zavvi Limited

Any bit of information will help.

Thanks!