Obsidian updated their latest news of backers rewards at the link below on July 31. 2018. It looks like if you live in North America, South America or Oceania the items will start shipping on Aug 6, 2018 from Ohio in the US. The rest of the world has the problem where the distributor went bankrupt. Obsidian did state that on April 3 they would update hopefully with new vendor info
https://support.obsidian.net/article/23-whats-the-latest-news-on-physical-backer-rewards