Pizza can easily be one of the most expensive meals of the week, if you get take out. We recently spend $35 dollars on pizza one Friday night. Then again you can make it at home and get so fancy pants that it is still massively overpriced. Pizza is just one of those things, it is what you make it. Dough is cheap and easy always, but toppings is where it gets out of hand.
I like to keep it simple when making pizza at home, one of my favorite flavor combos is tomato and goat cheese. When we were in Italy I ate one of two pizzas prosciutto and potato (which I thought was either squash or pineapple at first) or traditional Margherita. I suggest if you really want to go cheap take the Margherita route.
You can bump the pizza up another notch ( I feel like Emeril after typing that out, I swear it sounded okay when I thought it lol) by grilling the crust. It will add a crunch and flavor that the regular oven won't give you, and truthfully it will make your pizza have a texture much closer to the pizzas I ate while we were in Naples...crunchy and light. So try it out, grill your pizza; and save money by choosing cheap toppings!
I don't have any changes for today, pizza is as frugal as you make it. I just suggest going traditional and making a Margherita pizza!