"Mail Order Bride" is a D tune by Peter Ostroushko. He said he wrote it to have a sort of Ukrainian inspired sound. To my knowledge, there is no recording of Ostroushko playing this tune or publishing sheet music for it, but I have only researched the matter on Googleable sources and through a friend of a friend who collects music and has an extensive collection of Ostroushko recordings. I learned this tune from Ostroushko in person at a festival and, while I am confident that the tune as I remember it is recognizable to how he taught it, I would be interested to hear anyone else's version, if there is someone else out there who learned it off him. If you want to swap recordings, please send me an email.
For that matter, I've got a version of Abe's Retreat with a crooked A part that may be my fault and may be from Stacey Phillips, I don't remember. Reach out to me if you know what's up.