Look at http://www.dafont.com/typewriter-condensed.font (has three weights)

Thanks, but that's not really what I'm looking for. I should have mentioned that I want it to have a light weight and italics for all weights.

Italics? In a typewriter font?

Do you want these to be something like the cursive font that was on some IBM ball typewriters? Or just a slanted version of the roman, which you could make yourself?

Or do you not really mean a "typewriter" font? Would any monospaced font with a light weight and italics work?

The sans mono condensed

http://www.lucasfonts.com/fonts/thesansmono/thesansmono-condensed/styles/

has italics and multiple weights, and it is a fixed width font (and all weights appear to be of the same width).

Either type of italics is fine, but I don't know how to make them for myself. And I mean a monospaced serif font like Courier New, not a sans-serif code font.

Sans Mono Condensed is all right, but I would prefer a font that keeps the serifs in the italic version. It could be just slanted, or it could be different, like CMU Typewriter. If that font was narrower and lighter it would be perfect.

What about Letter Gothic?

Letter Gothic is okay, but something with more serifs like Courier New is what I'm looking for. I really don't think I'm going to find anything, but that's all right. Thanks everyone for trying.

"If that font was narrower and lighter it would be perfect."

monospaced fonts are made to a single width that all glyphs can survive on. That single width is a compromise allowing the m to condense and the i to expand while just maintaining marginal readability.

so what you are asking for doesn't exist, (with multiple weights and italics), for a reason. you are in luck though— Courier condensed can be simulated on just about any desktop computer for free, so you can see.

For a quite condensed light typewriter font with serifs, there is Latin Modern Mono Light Cond that comes in regular and oblique in the texlive distribution (MacTeX 2013 for Mac).

Its character width is 0.35em compared to 0.5em for Inconsolata (that I like) and Letter Gothic (at least the CTAN version).

There is a mono script also having width 0.35em, Script Mono Condensed, available from http://www.fonts101.com/search/condensed+mono (Corporate Mono Condensed has width 0.422em).

Courier condensed can be simulated on just about any desktop computer for free, so you can see.

O don't know how to do that with TextEdit or Word. With pdfLaTeX, I think I would need to add lines in the map files, which few users know how to do.

With XeLaTeX, it is however quite easy. If I declare

\newfontfamily\couriercond[FakeStretch=0.75]{Courier New}

I get, when choosing the font \couriercond

I stand corrected, desktop computers like TextEdit and Word are not capable of my suggestion. But other desktop computers, like InDesign, XeLaTeX and many other desktop computers are.

And those are 5 of the ugliest fonts I've ever seen. But if you're really trying to say "I really don't want to say it", they should work fine. Latin Modern Mono Light Cond, on the other hand, only needs bigger dots almost anyone can fix.

I don’t know how to do that with TextEdit or Word.

You don’t want to know how to do that… In MS Word, by cranking the ‘Scale’ control (Font… > Character Spacing > Scale) you can easily distort any font beyond recognition:

Thanks for the suggestions, everyone! I'm going to use Latin Mono Light (I don't think you can condense fonts in Pages). I like the LaTeX suggestion, too: I'll keep that in mind when I have to write mathematical documents. Thanks again, you've all been very helpful!