I'm new here and thus am not sure if this is where I'm supposed to post this.
But I have a number of NP strategy guides I'd be willing to donate if any responsible member/staff person wants to scan them for the site. I'm not sure what all you already have nor what your cutoff is as far as publication date. As such, I'll just list every one I have, and someone can tell me which ones I can donate.
The Legend of Zelda: A Link to the Past
The Legend of Zelda: Oracle of Seasons / Oracle of Ages
The Legend of Zelda: A Link to the Past / Four Swords
The Legend of Zelda: The Wind Waker
The Legend of Zelda: Four Swords Adventures (Player's Choice)
The Legend of Zelda: The Minish Cap
The Legend of Zelda: Twilight Princess
New Super Mario Bros.
Super Mario World 2: Yoshi's Island
Yoshi's Island DS
Metroid Prime
Metroid Prime 2: Echoes
(And yes, I'm pleased to report that the first Link to the Past guide listed above is the 1992 Super NES version guide. )
I apologize in advance that many of the covers, at least, are not in the greatest condition, being somewhat battered. (I got most of these guides online as used, so they came that way.) But if you can still use them, I'll offer them up!
EDIT:
Now looking back through this thread and the guidelines, it looks like the 1999 cutoff date goes for these kinds of guides too. In which case, that would make A Link to the Past and Super Mario World 2 the only guides I can offer. I actually think Oracle of Seasons/Ages should be valid as well. Technically, the games and the guide are 2001, but they're for the Game Boy Color, and I consider the GBC to be an extension of the original Game Boy and thus "retro" enough to count. What do you all think?