Every online order delivered within the Kingdom ships free by standard delivery, whatever its value. Riyadh orders take between 1 and 2 business days, and orders to Jeddah, Dammam or Khobar between 3 and 4 business days; outlying cities and regions can take as long as 10 days.
Cash on delivery appears in that same delivery table with its charge shown as “Free”, so choosing to pay at the door adds nothing to your bill.
Deliveries run from Saturday through Thursday, with none on Fridays or official holidays. Dyson won't ship to PO boxes or anywhere outside Saudi Arabia. Customer service can tell you whether your remote area is covered.
Source: Dyson Saudi Arabia: delivery and returns information