Where we could buy the machines useful on the site? Polish machines market is really extended

Our country is surely developed in terms of technology. So many nice working manufacturers are well prepared to make orders in whole countries. But what we can do when we must do big order for great customer? When we try to build local building we need to hire the crew and bring mechanisms. With the first one will be just little problem because we must choose between take them permanently or just for only one contract.