If you're looking to buy bulk, this place worked out well for me:
http://www.horse.com/default.aspx
I purchased two, 3 liter jugs of Lexol PH Leather Cleaner, and one, 1 liter jug of NF. I spray the inner palm of our gloves with the PH after almost every use and it seems to neutralize the sweat which keeps it all soft.
I stumbled across Lexol sometime in the late 80's when I was looking for some neatsfoot oil for my new Pro-H. Back then Lexol NF darkened the leather but it gave it a really nice patina. I wish you could still get it. The glove is still a gamer with absolutely no wear to the palm. The only thing that needs to be replaced is the binding on the back of the glove. The inner palm is buttery soft with no cracks, not like my XPG-3 which is really awful because of the gloveolium I used on it.