WTB: Half-Life 1 Rarities

Country: UK

Hi, I'm a big fan of Half-Life 1 universe (HL1, Opfor, BS, HL PS2/DC etc).

I was wondering if anyone had any valuable Half-Life merchandise, not interested in anything Half-Life 2. :rolleyes-new:

Some items I'm currently after:

Half-Life: Day One OEM (I think there are different versions of this depending on the video card)
Preliminary Findings (promo content showcasing early development of the game)
Half-Life Initial Encounter (only interested in sealed unopened copies)
Any pre-release builds/promos
Pre-release advertisements (posters etc)
E3 Atlanta 1997/1998 footage/press releases (Half-Life related of course)
Magazines

Basically anythings of a collectors value. Anything new and unopen is a huge plus.

Reply with the condition and price of the item, or better yet PM me.

Thanks!