I'm in Canada. I don't think budgies could be shipped to you there due to 'migragion' laws, lol. Unfortunate. I have 4 of the df spangles offspring...don't need them all. It would be great to help a bird friend.
It's the Spangle's markings that are reversed. Opaline is as follows.The opaline budgie has the barring over its head and down between its shoulders greatly reduced. The markings on the back between the wings should be gone, though often they are present but finer and sparse. The opaline gene also softens the body colour slightly so that it is a little paler than a normal of the same colour.A main feature is also that the body color of the budgie (ie green, blue, grey etc) has replaced the yellow or white on the wings. So instead of having black markings on a yellow or white background they are on a green or blue or grey etc background. The body colour also often shows on the black part of the wing feather and this is called opalescence and can be attractive.
Thre is also, on the flight feathers a 'thumbprint' of either white or yellow depending on whether it's a blue or a green series.