Time-sensitive order ahead of a sales push — 500 fat-tire e-bikes

We're planning a major promotional sales push and need inventory in hand before it starts — this order is time-sensitive in a way our regular restocking isn't, so lead time matters more than price here. Spec: 250W rear hub motor, 48V removable battery, hydraulic disc brakes, front and rear suspension, 20" fat tires, steel frame — our standard configuration, nothing custom needed for this order. Quantity: 500 units in one shipment, ideally consolidated rather than split, so we have full inventory on hand before the promotion goes live rather than trickling in mid-campaign. We need UL 2849 documentation on file before launch — no exceptions, since it's a condition of our marketplace listings and payment processor. Delivery: DDP to our Phoenix AZ fulfillment center, and we need a firm, reliable lead time quote — a supplier who can commit to a date and hold it matters more to us here than getting the lowest price. Please quote: unit price for 500 units, your fastest realistic lead time from PO to delivery at our warehouse, whether expedited freight options exist if needed, and confirmation of UL 2849 status.