You don't need money to buy Bitcoin (Cash)

You could exchange a pizza for Bitcoin.

Or sell anything else that you would normally sell, but for Bitcoin.

I don't mean BTC. That shit has deviated from the p2p cash initiative, and its fees are too high to encourage spending 'as cash', which is why you won't succeed in using it commercially.

But p2p cash is still alive. Try Bitcoin Cash (BCH) for that purpose!