I bought mine from Amazon a while ago; looks like they're currently in stock.
https://www.amazon.com/gp/product/B00GOZUNCU/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
https://www.amazon.com/gp/product/B003YC45SE/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1