Finding e-book readers and software can be a pain, so I thought that a post with some links would be helpful.
If you're looking for an actual e-book reader, then there are readers available at prices ranging from @ $100 and going up into the $500 range. Kindle is probably the best known now, though there are many other good ones available, including from Sony, Barnes and Noble, Kobo, and others.
Kindle Store
Walmart e-book readers - Various Brands
Walmart Canada - Kobo and Sony e-readers
**Note that prices change, and I'm told the Kobo is selling for less than advertised on the website.
If you're looking for readers for you iPod, iPad, or iPhone, there are free apps available at the istore, including Stanzi and Kindle apps.
Apple App Store - Kindle Apps
Apple App Store - Stanza e-book reader app
Kindle is also available for your Blackberry. Type "amazon.com/kindlebb" (without the quotes) into your blackberry browser to download the program.
There are many e-book readers for PC's, so I'll just list a few of them here.
Kindle for PC
Stanza e-book Reader
Barnes and Noble Nook e-reader for PC, iPhone, iPod, iPad, Android, etc.
Happy Reading!