Saudi Arabia has very severe laws when it comes to crime so 99.99% of the times you should not have any problems and like Zarzuella recommended INSURE the item cause its a very long trip and anything can happen.
Also - if they pay you via PAYPAL then just know in advance that SAUDI ARABIA is not on the list of eligible countries for SELLER PROTECTION so you will be exposed to a potential - ITEM NOT RECEIVED dispute and proving delivery will be impossible using CanadaPOST.
Depending on the value of the item I would accept using BIDPAY and or Moneybrokers, but definately not via PAYPAL.
Good Luck,
TIM @ FTL