I have the 4th edition (2005 update), which is only $8 used on Amazon:

http://www.amazon.com/Strategy-Tactics-Pricing-Growing-Profi...

But honestly any edition is great - its sold as a textbook[1], so they seem to make periodic, cursory updates, but the substance remains unchanged. I suspect the 1994 edition is fantastic as well, and perhaps available in your local library.

I hope you like it, and get as much out of it as I have! And thank you for taking my recommendation, that made my day. :)

[1] That its a textbook is perhaps my favorite meta-lesson of the book itself. How do you charge $100 for a book? Call it a text book!