Ice block business is a very good business.The demand for it is very high but you need to also have a marketing plan.The capital isn't fixed,which largely depends on how small you want to start.
The machines can be got in Nigeria,although,we have both imported and locally made here.
This is the season for the business and if you reside in Lagos,this is about the best time to start as you can recover your initial capital by Decemeber.
You can mail me for more details
vividgate@yahoo.com