You have (as I see it), 3 options to consider:
1. Buy it now
2. Wait for Black Friday sales and hope it's there (there may be a splash screen notification about what's going on sale, but not till it's just about to start), or
3. Craft it in the Trade Wagon for 70 gold tokens.
It is a rare sale item, yes....
Alternatively, if it's alicorns you want more than the other items offered in the tent, consider crafting the Mythic Research Centre as you can then craft your own energy-giving daily alicorns.
https://forums.storm8.com/showthread...s-How-it-works
Hope that helps!