If books were tagged "public domain" or "copyrighted," that'd (1) allow exclusion of PD books from low-price searches and (2) allow site users to realize that the PD book they're seeing at $1.99 to $8.99 might be available free somewhere.
You'd have to decide which jurisdiction(s) public domain you'd use. And when you get user logins, you might figure out a way for them to tag books; if they like the site, they'll do most of the work of categorizing books for you. You might still need to check (especially PD vs non-PD), but it'd be a lot easier to verify info than to establish & note it in the first place.
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