Build A Bookshelf

I'm going to have to get rid of our Ikea bookshelves soon.  They are simply not practical for a family that has to move every 2-3 years.  So then, the question is this: where do you find bookshelves that are 1., portable, and that 2., can hold a LOT of books -- I'm talking hundreds of books.  So after a short search online, I've found some plans for a bookshelf from a website called "instructables." The site has a great post which lists the cost and necessary supplies in order to make some sturdy, portable bookshelves.  And bonus: the design can be modified so you can make them smaller or larger...design to fit.  Finally, they are inexpensive.  The authors total cost looks like this:

Lumber $39.62
Hardware $18.24
Total: $57.86

Not bad.  Check it out HERE.