Oikostreecrops isn't what it used to be (I got a number of hard-to-find tree-selections from them, including hybrid chestnuts), but they still offer a few things and it's at least interesting to browse around the site. Brother just a couple yrs ago took advantage of a rare offer and got a dozen of Yucca filamentosa from them, and all have survived and prospered.

https://oikostreecrops.com/products/?pg=466