I hear ya...I went down quite the rabbit hole with the Yamato that I had to give up on some lines lol.
I'm not sure that they did, but I saw that Amazon had a Zero for sale with Prime and grabbed one. I got the Falcon from AmiAmi which also has the Zero if you want to grab from them. I'm still trying to get Yamamoto's Zero and Shinohara's Falcon. I think it's really hit or miss once an item goes into backorder at HLJ. For example, the Macross Armored Factory has been on backorder for a couple years now.