try to find tursted member or use escrow
go to service and will find many green trust can sell you cheap bitcoin
Talking about escrow. If remitano is available for your country, you might want to consider them. I have been getting my coins ever since at the exact market price and at my fiat to USD exchange rate and I have never had any course to ever stop using them.
They basically use a solid escrow system and since it is a P2P exchange system, you can always check the profile of the person you want to make transaction with and how long and how much they have dealt so far.