bumblebee
Mame
I have had good experience buying from this seller.
Libby
Libby
I have had good experience buying from this seller.
Libby
Are you confident that they are Shimpaku?
Probably all of the above for photos, but they don't look unlike shimpaku from the limited photos shown. They're easy enough to get and to propagate, so nothing seems out of the ordinary.
They may not be common at Lowe's or HD, but I've never been to a bonsai nursery that didn't have just rows of them. They're so easy to propagate, that anything that hits the ground with the foliage pointing up should root.