Plugin to ship from location depending on shipment method

I have 2 warehouses in the same country, one on the East coast, and one on the West coast. I’m trying to find a plugin that will allow a user to check out a product, then depending on where the product is being shipped from, and the shipment method, the appropriate warehouse will be used.

For example, I want all my orders that are standard shipping time to come from the west coast. If someone on the east coast buys the product, have the product ship from the west, and deduct a stock item to track the quantity. However, if the user wants the item expedited, then the shipment will come from the east coast warehouse, and again a stock quantity will be deducted. I have yet to find such a plugin, and really need it.

Thanks for the help!