I'M TYPING this one-handed. A cold slice of the first decent deep-dish pizza made in Portland is occupying 50 percent of my digits, and I'm not about to put it down until I'm done. Thick, a newer food cart in the SW 3rd and Washington pod, is making pies that hit more bases than the hapless Cubs this season. With at least an hour's notice, order a whole pizza for yourself at an obscenely low cost. A whole cheese pizza starts at $20, while a half pepperoni and half spinach ran me $24. Cline leaves the whole-pizza topping options up to the customer, and with even more advance notice, he'll whip up cart-made sausage. ANDREA DAMEWOOD