If you’re new to the domain investing (even if you’re not), then you likely encounter a how cumbersome of a task it is to identify undervalued domains.
From NameJet to GoDaddy to Dynadot to SnapNames along with many more domain auction aftermarket platforms, identifying and narrowing in on undervalued domains — whether expired, public, private, or closeout — is a full time job in itself.
Thousands of domains expire in auction daily (as a subset of data is shown via DomainState.com chart below), and an unidentified number of those domains go on to be caught, or deleted and made available for hand registration (small percentage, but still happens).