No, as of June 17th it's no longer possible to choose a specific fulfillment center for your orders. We've made this change in order to ensure the entire shipping process runs smoothly for you and your customers as we continue to grow.
We route orders using an advanced algorithm, taking into account the end customer's address, where the product is available, and other factors. 99% of the time, the algorithm chooses the closest fulfillment center to your end customer, but rarely—usually if a product is unavailable—it will be routed to another location.
If you have opted out of a facility before June 17, then this change will be effective for you as of September 1 so you have time to adjust.