https://ahrefs.com/blog/buy-backlinks/

Conclusion :

It would appear that the link buying and selling industry in 2018 is alive and well.

I’ll leave it up to you to decide whether $361.44 (or $77.80…plus content) is:

a) worth the money b) worth the risk of getting caught

If you want our advice, buying links is rarely worth the money.

Why? Because it’s riskier and more expensive than building “natural” links (in most cases).

But, if you are going to pay for links, it looks like buying guest posts will probably give the best bang for your buck.