I called a local science store and asked if they knew where I could order one. I know I've got a couple of eyeballs here somewhere left over from my science-teaching days. Libraries, bookstores, friends, and catalogs can provide information. A subscription to Homeschooling Today is very helpful. I even like to read the advertisements to stay abreast of materials that are on the market.
All professions have their journals and homeschooling is no exception.
Also, ask if you might observe them in action. I sat like a little mouse in the corner of my friend's schoolroom. I had taught school for five years but could not visualize how to do it in a home setting. Vernell welcomed me and was pleased I was interested. I watched her son learn his math facts.