There's an excellent "chain" here in PDX called Pizza Schmizza. Thin, crispy crust -- not that yucky stuff from Pizza Hut, Dominos, et al.
And they deliver!!!
I usually hit the walk-up window around the corner from the Fox Tower 10 cinema. Cheese is $2.25/slice, Pepperoni $2.75/slice, everything else $3-$3.25. Nice sliced-shaped To-Go boxes keep it fresh and reasonably warm until you get to a park or the office.