I think that you should get an item as a caster who can use a focus, amulet, or components pouch and pick it as a vanity item. Their intent is to NOT be used and are assumed to have all components needed for non-consumed spells. A piece of tree struck by lightning for electricity is you using it as a tuning fork focus to help shape the weave as you cast, it doesn't use so youd never need to go shopping for another one.
Thins like summon familiar needing incense should be handled as spell transcription is. It costs a certain amount of ink and paper, and it is deducted from your purse.
Needing 300gp diamonds for resurrections sounds fun until you dont have one and getting back to camp is going to be annoying. The cons probably outweigh the pros.
Overall, keep things that cost money just be money. Its too much work for them to maintain a good frequency and density of items, especially if its an MP 2 cleric 2 wizard party or something.
I think you should be able to make yourself look cool though ^.^
My wizards components pouch is a bunch of ground up components like fleece and bark and ash that he poured into moulds and made into buttons and sewed them to button up his omni-worn green felt vest. Wizards like having them, its personal
