LEGO 8014, Clone Walker Battle Pack, comes with 4 clone troopers and 1 clone walker. You'll want to buy as many of these as possible to create the size army you'll shooting for. So, if you want a clone army of 40, buy 10 set. You can buy them here
at Galaxy Bricks, the LEGO Star Wars Guide. Typically, the retail price for this set is around $10.99. So buying 10 of them will cost you around $110.
Now, don't panic, we will be recouping some of your money.