Ahh yes, Sardella's and their $5 medium pizza special. The location near 19th Ave and Union is my Sardella's home base. We grab a cheapie medium cheese to go quite often (the price is not good for delivery).
The toppings, ingredients & cheese is much better than what you would find at those national chains.
For a small shop cooked, good medium pizza, you can't beat 5 bucks. Try their ranch dressing as well. It's made in house and is delish.