Tax is not just based on the price. If the fact that you were getting it for free were good enough to avoid import taxes, everyone would just have friends in other countries send them 'gifts'.
Well, in Brazil books are exempt and stuff that gets shipped gratis along with them doesn't get taxed. Usually, it's CDs and once I did see software shipped as Manual+free CD in order to evade taxes. I was quite surprised (and a tad disappointed) that it worked, but I don't think it would work with larger products.