From Shaiya Wiki
There is a Warehouse Keeper in every major village/town. You can use them to store your weapons, armour, food, potions, etc. but they can't be used to store your gold.
- A fee of 5% of the items purchasing price will be taken for storing your item.
When you buy items from the Web Item Mall, they will be sent to the Bank Tellers. Talk to a Bank Teller to collect your item, you can find a Bank Teller in every major town/village. The Bank Teller is also where most Event/Promo reward items will be delivered to.