Remember the old saying "kapag maiksi ang kumot... (if the blanket is small...)"? It's all about making do with what little you have. And if you have a limited budget (stress on 'limited budget') be creative and see how far you can stretch it.
In one of my conversations with my father, he said that if the requirement is huge, it is cheaper in the long run to make your own hollow blocks (or concrete blocks) than to buy them. After all, all you need is the know-how, a mold, some sand and bags of cement... plus of course a lot of sweat. And that is the birth of another do-it-yourself project.
Hopefully this won't be a penny-wise and pound-foolish venture. We'll see, we'll see...