oh , I totally forgot that part of DnD because I NEVER use it because I think it's stupid a laborious. You do not need to use items, materials or what have you (like a 100g pearl) to cast a spell. It's just too much too tack, it makes things difficult and it's a lot of money to do stuff. Sorry if you like that about the game but as a DM and player I always ignore that and play without it.