Anderson FlexZilla is a -11. It's discontinued so you will have to do some looking around.
I'm eyeballing that bat but I can't find it in 31/20. Thanks it's on my watch list for sure.
By the way, looks like the Louisville Slugger Mendoza Pride -13 (black and blue zebra) is now discontinued. I'm waiting on 4 that I have coming in the mail. I picked them up for $15-18 each with combined shipping. That is a really popular bat in our league with the younger 10U and 8U players.