To begin with, Direct Contracting is only applicable for the procurement of goods.
There should be a market research and survey first. If goods turned out to be available from a “single source” and there are no suitable substitute, then Direct Contracting may be resorted to using any of the conditions enumerated by @Edita Nota
There should be a market research and survey first. If goods turned out to be available from a “single source” and there are no suitable substitute, then Direct Contracting may be resorted to using any of the conditions enumerated by @Edita Nota