[*Banishment*](https://www.dndbeyond.com/spells/banishment) requires a specific material component:

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> an item distasteful to the target
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> 
> 

So does [*summon greater demon*](https://www.dndbeyond.com/spells/summon-greater-demon) (XGtE, p. 166):

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> a vial of blood from a humanoid killed within the past 24 hours
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> 
> 

I thought I had seen this question here before, but I couldn't find it to double-check, so I'm asking again. 

**Are these components with unique attributes assumed to have a cost?** Or can they be replaced by a component pouch or arcane focus?

My interpretation is that *cost* isn't just gold - it is any sort of condition on the item (so, distasteful items or blood with timer requirements have a cost). Therefore, both these spells would require specific components to be cast. Is my interpretation correct?