I considered Microraptor but there doesn't seem to be an European dealer. Shipping from USA is too expensive.
So I plan to get B&W Type 61 Case for DJI Phantom 3. It seems to have the smallest outside dimensions of the cases that allow the props remain installed.
Well seeing as you quoted £££ I assume your in the UK, how about the b&w type 61 phantom 3 case found on amazon, save another £30 and it's yours, I have a yellow type 6000 for props off and it does me for now