Wheat bags are great for varietys...errors usually get yanked Bank boxes for current if your searching for coins If puchasing then outright, Fred Weinberg is the error man for high end stuff, google him, OR you could always try Fleabay..... What are you looking for?
If your looking for information on cents and their errors, try www.coppercoins.com On that web site there are tons of people asking all sorts of questions on just cents. Also, there is tons of information of each year available there. If you have access to books on coins you may find that the person that has that web site has two books out on just Lincoln Cents. As to acquiring them, your probably a little late unless you dig them up in a yard somewhere. It seams like the whole world is now after a Lincoln Cent collection.
Carl is right coppercoins is one of the better ones to find info on cents. But there are so many sites out there, there is too many to list them all but here are a few more. www.coinnews.net www.uscents.com www.conecaonline.org www.error-coins.com www.coinfacts.com Good luck and happy hunting.
Buy a copy of the Cherrypicker's Guide(Fourth Edition- Volume One). Or Here is a fairly new site dedicated to the Lincoln cent. http://www.lincolncentresource.com/ And Here is a 1984 Doubled Ear (FS-037) I found searching circulated rolls yesterday.
