Yes, I finally did it, and I'm very pleased with myself. It was as simple as walking into the shop and paying. Blimey!
The egg is quite large compared to a chicken egg, and visually exciting: white with brownish speckles. It's also a really pleasing eggy shape, with a nicely pointed narrow end (or "top", as I like to call it). There's a nice weight to it, too; it feels good in the hand, quite "lobbable".
Now I need to devise a method of preparation and consumption that will do justice to the sweet, exciting little thing. Until then, I'm going to sit it on my kitchen window where I can look at it.