I was lucky to pick up 11 of them when they ALL showed on eBay about 6-7 years back. Many of them picked up while there still was a debate as to whether they were authentic or not.
At one time I had roughly 1/7th of all the Herps out there
Somewhere I even have a list with prices realized for each of the cards.
The first couple weeks (original seller sold them a few per week) the cards went for as low as $50 ea. but by the end (when everyone knew they were authentic) they jumped a bit and were selling for 2-4X that.
PS. The Ruth was last one sold and it brought $7,777, and Cobb brought $1,526