Vulnerability scanning software

I am looking for some vulnerability scanning software that will be able to scan a couple of servers and identify any vulnerabilities that exist, detailing what is vulnerable and how to resolve etc.

I found exactly what I was looking for InsightVM (https://www.rapid7.com/products/insightvm/). I only have 2 servers, but after speaking to them I found they charge a minimum of 250 servers so that's over $6000+ - not something I can do.

Does anyone use any similar tools that they would recommend that would have a much more reasonable pricing for just 1 or two servers to be scanned.