You can find fifth grade practice books and workbooks at Barnes & Noble and Books-a-Million. Most book stores carry these and other tools for learning.
Physical book stores like Barnes & Noble and Books-a-Million carry a variety of workbooks and practice books. If you would rather shop online, Books-a-Million offers them in Tools for Learning, under the Kids category. On the Barnes & Noble website, users can search "fifth grade workbooks." For a more budget-friendly option, you can also find these kinds of learning aids in the books section at Walmart stores and on the Walmart website by searching "fifth grade workbooks."