There are many AG Supply stores in California. As you don't specify where, the best bet would be to do an online search for something in your area.
They have a magazine you get if you order the AG magazine which is not a lot of money and then you can order it, or you could go to an AG doll store somewhere and find a sales clerk and they'll take you from there. They also have a website.
At any AG store
Lanie is now retired so you won't find it in the ag online store or in the actual store. You might find it if you search on ebay. I don't know for sure, but it's worth a try. I wish you the best of luck finding it!
The web address of the Heidrick Ag History Center is: http://www.aghistory.org
Preferably the AG brush that you can buy at the AG store, but any metal tip brush will work. If you don't use a metal tip brush, it ruins their hair.
Well you don't have to it is your choice unless she is getting her hair done at the salon but you can if you want to
The phone number of the National Ag Science Center is: 209-521-2902.
The web address of the Double T Acres Ag Museum is: http://www.thedoublet.com
Amateur Geologist is your one stop shop for rock hammers and any other geology tools you might be interested in. AG also have a useful guide to picking the right rock hammer for you. If you're looking for something cheaper, amazon and ebay are also normally well stocked in rock hammers.
There are plenty of sites that do carry AG as well as other models. When I looked into AG products this is the website I went to: www.tractorhouse.com
The phone number of the Double T Acres Ag Museum is: 209-634-0187.
The address of the National Ag Science Center is: Po Box 4937, Modesto, CA 95352-4937