It could be you want to buy volume licenses for a single company then provided you need 5 or more licenses you can buy Microsoft Volume License Product.
However if you want individual Licenses for different Licensed Windows/Office Product you need to buy individual Licenses.
Depending on the number required Microsoft Directly for large numbers or one of their Business Resellers for lower numbers.
Remember you can not go Overseas and buy Microsoft Product in places like India if you live in a different country. Microsoft has not licensed those products for use in First World Countries and they are considered as Forgeries and subject to Normal Microsoft Legal Actions.