Steve,
These copies can be purchased over the phone as well, by calling the WRHS, as long as you know the folder number of the photo you want. The WRHS has about 500 photos in the VanOeyen collection, about 26 of Babe Ruth. At least that is what they have on their index list. Their index list is for sale, however many on the list are unidentified, and remain so.
I posted a couple of sample pages on a thread about a year and a half ago. The photos remain unidentified. Getty owns many of the negatives to the original photos they have on file. The WRHS is allowed to sell a copy from the originals, but I am sure Getty gets the majority of the $10.
Here is a link to the thread I started some time ago, with an example of two of the index pages.
http://www.net54baseball.com/showthread.php?t=189967