I'm a big fan of Papa Murphy's Take & Bake stuff. You can use it as a template for cheap and then add your own toppings. We have a few great local pizza places like Blind Onion Pizza, Blue Moon Pizza and JJ's Pie Company, if anybody is ever in the area.
As far as chain's go, I think I usually go with Pizza Hut or Round Table, but cheap pizza is kinda all the same to me.
But I pretty much just make cheap french bread pizza at home.
Patrick's Cheap & Easy French Bread Pizza:
$.99 loaf of french bread from your local Safeway/Grocery Store
1 red bell pepper
1 green bell pepper
1 package fresh mushrooms or 1 can sliced mushrooms
1 can of sliced olives
1 package of your favorite pepperoni
1 jar of your favorite pizza sauce
1 bag of your favorite mozzarella
Cut the loaf in half, spread sauce, sprinkle cheese, add toppings, top with cheese, bake at 375¨? for 15-20 minutes depending on elevation.