VTU Business is much more profitable if you get yourself a VTU Portal.
But if you are not able to get one you can buy Data and Airtime from any VTU portal online the fun thing about it is that you got to set your price as you buy cheaper on the portal.
For instance, you can buy from this [url]sabuss.com/mobiledatavtu3/[/url] portal at 240 for 1GB and Sell at 300 or 350 for 1GB and make a profit of 50 - 100 to your pocket.