Sorry to hear that.
But I can assure you, that it will take only a short while, until you run short with 64 GB extra again.
And, just to make you happy, there already is a solution for you:
SanDisk Extreme ® microSDXC ™ UHS-I CARD with 1 TB
Fast enough to keep up with the action
Get extreme speeds for fast transfer, app performance, and 4K UHD.2 Ideal for your Android™ smartphone, action cameras or drones, this high-performance microSD card does 4K UHD video recording, Full HD video, and high-resolution photos. The super-fast SanDisk Extreme® microSDXC™ memory card reads up to 160MB/s* and writes up to 90MB/s.* Plus, it’s A2-rated, so you can get fast application performance for an exceptional smartphone experience.
If that doesn’t do it for you, you are lost (in my opinion), since another 64 GB would mean just 6% more memory.
And the SDXC-Card is at the moment available in Germany from € 333 and in the UK from € 406 (according to the price-comparison page Geizhals).