Where can I rent cheap power tools in Manila?

Generally speaking, tools are an investment that you don't want to be frugal with. A good set of tools can last you a lifetime, so you don;t need to be too cheap. But any Ace hardware or True Value should have you covered! Those are the most reputable I can think of, and they more than likely have options in terms of pricing. If you're interested in saving a lot, though, you could also check out what people are offering on OLX.