I certainly think you could leave off the bottom row. It would just make the quilt shorter. You could add extra borders to make up for the length, if you wanted to do that. Try piecing your top together without the bottom row, and see how it looks. If you are determined that you want the last row on there, you might just have to buy a bit more fabric, or see if anyone here has some they would be willing to send you.
Let us know what you decide! I really like the Yellow Brick Road pattern! :D
Good luck!
~Heather