If you are resident of Tennessee you have access to a number of genealogy databases from the comfort of your home thru the Tennessee Electronic Library
Currently you can access the following thanks to TSLA's agreement with Ancestry.com.
Tennessee, Delayed Birth Records, 1869-1909
Tennessee, Death Records, 1908-1958
Tennessee, City Birth Records, 1881-1915
North Carolina and Tennessee, Early Land Records, 1753-1931
Tennessee, Early Tax List Records, 1783-1895
Tennessee, Enumeration of Male Voters, 1891
North Carolina and Tennessee, Revolutionary War Land Warrants, 1783-1843
Tennessee, City Death Records, 1872-1923
Tennessee, Wills and Probate Records, 1779-2008
Web: Tennessee, Supreme Court Case Index, 1809-1950
HeritageQuest(made available thru ProQuest) and a few other databases are available as well. Some may require your library name and card number while other's will check your IP address to iusure you are in Tennessee.
If you are a resident of another state, check with your state library to see what they offer. I think it's highly likely that they too have some free databases available.