I went out to my Kroger store and they didn't have the $50 cards either. Just the $25 or load your own price.
I spoke to the customer service person and she said if I got 2 of the $25 ones, she would take $10 off. I jumped on that and grabbed 2 and she rang it up and when the $10 came off it said "customer loyalty discount".
Just wanted to post in case some others can ask in their local Kroger if they would do this too.
Now I wonder if I found a $50 card at another store
if it would take off $10 for me