Ditto on Walmart for cheap target loads. Dicks Sporting Goods also has good pricing on birdshot this time of year. For 00 or 000 Buck try Cabelas or other bulk dealers for surplus military or LE.
HD ammo packaged as such is usually very expensive at $25 for 15 rounds, not a good deal in my opinion.
"The whole of the Bill (of Rights) is a declaration of the right of the people at large or considered as individuals.... It establishes some rights of the individual as unalienable and which consequently, no majority has a right to deprive them of." (Albert Gallatin of the New York Historical Society, October 7, 1789)
"A free people ought not only to be armed and disciplined, but they should have sufficient arms and ammunition to maintain a status of independence from any who might attempt to abuse them, which would include their own government." - George Washington