There is an offer going on right now. You can get that sweet t1 alpha, t3 basic, t2 alpha or even t3 class from that offer.
Or if you don't want to spend energon on that deal, you can get it from spotlight mission.
What are you spending your energon on? If you're buying crystals, stop doing it and save. You can easily make at least 1.5k a month which, if you save, will let you buy the t2a energon offers and help you get past wherever you're stuck.
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Or if you don't want to spend energon on that deal, you can get it from spotlight mission.
I tend to get a T2 alpha every month, from AM (map 3 diff 10), spotlight (hard and expert), and occasional Raid store item.