It's not surprising news that printer ink is expensive - that's how printer companies make most of their money. Unfortunately, you can't really avoid buying it.
You can, however, maximize how your printer ink is used. That's where the online service PrintWhatYouLike comes in.
The name is fairly self-explanatory - it allows you to select only certain parts of a website to print. That way, you aren't wasting paper and ink on nonessentials.
You can change the size of the text or turn off the background. It's a very flexible system. When you have just the part you want, you can print. You can also save the finished page as a PDF or HTML file.