This post will help find relevant expired domain names to your niche blog or online store for free.
Do never fall for higher DA, PA, CF, and TF when buying expired domain names for whatever purposes. Always go for relevant backlinks to expired domain that you are planning to buy.
Paid or Free Tools,
Now, there are many free and paid domain research tool in the SEO community. Few old ones are domainhumber, spamzila and expireddomains. In this SEO tutorial I am using expireddomains, which is completely free domain research tool and also has plenty of features to explore.