We have a bit of information concerning these two mystery variants that popped up a few days ago. Apparently a store called Star Clipper in St. Louis will have them both in store and on their website. There are rumors that this one will be available elsewhere, but for now, these guys are the only ones that have contacted us with a confirmed location.
Hope you collectors are able to get it! Lyra, Derpy, and Bonbon on one book is definitely one of the most fan-oriented versions.
Also found at Casa Blanca Comics!
Update: Have a list of a bunch of stores.