Even if they were 2k each (which they won't be), a hundred of them is 100 x 2000 = 200,000 USD. So again, we're unsure of how anyone can walk into anywhere, buy a fuckload of pickup trucks, import them into a hot, sandy, ripe for regime change country and no one notice.
And it's not even about the price. Pick up trucks aren't inconspicuous objects. You can't hide one under a blanket like an RPG or a rifle. A hundred of them is essentially a transport ships worth of trucks.
Whether it cost a billion dollars or a 30 pence, surely someone, somehere is noticing this.