Is it possible for a character to purchase their original species back? Or even parts of being that species? Say a robot wanted to be metal again, or have circuits inside them, or say a Time Lord wanted his second heart... Would that be for sale in the Abilities Store, or would what's in the Abilities Store be limited to the specific abilities that come from being that species? As in, would Aigis from P3 be able to buy back her circuits, or just the ability to shoot bullets from her fingers? Would the Doctor be able to buy back his regeneration abilities, but not his inside physiology?

And what about the TARDIS? And for that matter, what about multiple Doctors, given that they're not the same regeneration?