Justin Turner, Brandon Drury, Evan Longoria, Adam Duvall, Robbie Grossman, Wil Myers, Trey Mancini, Edwin Rios, Taylor Rogers, Andrew Chafin, Matt Moore, Cory Knebel, Michael Fulmer, Reyes Moronto, Chad Green, Trevor May, etc.
Any of those guys I could see the Brewers being interested in and are not out of their price range. "Second-tier" may be too loose of a term here as not all of these guys are that level, but they represent the next-best options now that the premier free agents have largely signed and would add something to the team for next season.