i know there are some succulent soils and cactus soils for sale in some stores.
but if you want desert dirt... i might can help ya.
i live in the desert. all my cactus i just plants right outside. smack in my yard, no preping.
the dirt drains fast, and absorbs rather fast.
now, there is nothing special in this dirt, it just comes from my back yard.
if you wish to be sent some, we can probably work it out on how to ship it, how much, etc.
doing this for free... only shipping to be covered. dont expect anything in return.
i'm just offering since some people have a cactus, but not the dirt. and regular garden soil isnt good for them.
so if you need plain desert dirt. i can help ya