You can also find used ones on different auction sites like EBay and Abe's books. Don't be afraid to buy an older version to begin with, the
information hasn't changed enough to make any difference. At least with the most common breeds and varieties. If you feel this is something that you are going to do for some time then by all means by a new APA Standard when they come out this fall.
Keep in mind that the APA and ABA use the sale of their Standards of Perfection as their main money making venue, so it would be wrong to allow it for free on the Internet.