Making pizza in large quantities (making anything in large quantities really) actually ends up being cheaper than buying them. It's also easy to freeze them for later use so that could be a good plan... I like using different herbs and toppings on the different pizza's so they all end up tasting different, but due to the cheese on top it's usually a surprise which pizza you'll get.
And yes, the recipe I found makes tapa out to look easy. I've decided that'll be my cooking attempt next time I'm having friends over (we always cook something none of us have tried cooking before. Last time it was manju. It was num. I've had store bought ones before and they were VERY different. Still tasted good though...)