If you want to collect all of the varieties, there were circulation coins in zinc composition issued for both Philadelphia and Denver mints as well as 95% copper coins for both mints issued in uncirculated sets as well:
Quote: There are 20 different varieties of the 2009
Lincoln Cent.
2009 Philadelphia Copper-plated zinc Lincoln Birth Year cent
2009 Philadelphia Copper satin-finish Lincoln Birth Year cent
2009 Denver Copper-plated zinc Lincoln Birth Year cent
2009 Denver Copper satin-finish Lincoln Birth Year cent
2009 San Francisco proof Birth Year cent Copper
2009 Philadelphia Copper-plated zinc Lincoln Formative Years cent
2009 Philadelphia Copper satin-finish Lincoln Formative Years cent
2009 Denver Copper-plated zinc Lincoln Formative Years cent
2009 Denver Copper satin-finish Lincoln Formative Years cent
2009 San Francisco proof Formative Years cent Copper
2009 Philadelphia Copper-plated zinc Lincoln Professional Life cent
2009 Philadelphia Copper satin-finish Lincoln Professional Life cent
2009 Denver Copper-plated zinc Lincoln Professional Life cent
2009 Denver Copper satin-finish Lincoln Professional Life cent
2009 San Francisco proof Professional Life cent Copper
2009 Philadelphia Copper-plated zinc Lincoln Presidency cent
2009 Philadelphia Copper satin-finish Lincoln Presidency cent
2009 Denver Copper-plated zinc Lincoln Presidency cent
2009 Denver Copper satin-finish Lincoln Presidency cent
2009 San Francisco proof Presidency cent Copper
http://lincolncentsonline.com/2009%20Cents.html