There called "Load Books" and are available from Midway www.midwayusa.com
All they contain is copies of the older data from the various manfactures, and if your loading more than 1 cartridge you will be buying more than 1.
Personaly I'd recogmend getting the newest manual from the people that make the bullets you use (you get more than just the data, and more than 1 cartridge). Having manuals from more than 1 manfacture is never a bad idea.

They are also available from Cabela's I believe, but like Tailgunner said, you are probably better off with a load manual or two or three from the various bullet and powder manufacturers because the cartridge specific manuals are only available for certain common calibers like 30-06, 300H&H, 375 H&H, etc.

Best compilation manual I've ever seen is Metallic Cartridge Reloading 3rd edition by M L McPherson. Published by DBI books, Inc.
Real good tech info, too.

I think the Lyman # 48 manual is hard to beat because it isn't tied to a brand of bullet or powder