In Altered Carbon, Stacks are sometimes transferred to another Sleeve.
Eg. The little girl who dies and can only afford and old woman sleeve.
Other than convicts (who surrender their sleeve when they go on ice) and manufactured sleeves (synthetic or clone) where would you get what I call an Natural Sleeve?
If the sleeve was of use to its current stack, why would they give it up?
And of it were NOT of use to its stack (ie: dead) how would it be usable for someone else?
Could it be that someone traded up and traded on their old sleeve?