No matter where in the game you are. That's really overpriced. I would rather grind the f out of arena and all the other mods that gives t2/t3 to sell for higher level shards, than spend 2500 energon on that. To be fair, most of the recent energon deals are not worth it, keeping in mind how hard is to earn (not buy) that energon.
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They are for leveling 5 star bots up to Rank 3, right? What else is required for that promotion?