Family Finder at FTDNA is a separate product -- FTDNA also has a number of different tests for the Y chromosome and mtDNA. 23andMe includes Relative Finder along with all its other reports.
You can now order the AncestryDNA test without waiting for an invitation. There are two different prices. There's a discounted price for subscribers -- if you have an account, log in to it before you click on the DNA tab (top of the home page) to order the test.