I might be reading it wrong, but are you not using the client store (represented by the stack of coins)? That is a sure way to see the price in Blue Essence (BE). However, you should be able to see the price in Blue Essence even from the Collection tab, so are you sure you did not confuse the champion itself with a skin for that particular champion?
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I'm level 13 and have only done the tutorial and played 5 vs AI Co-Op. When I go to the backpack Icon and scan the champions I do not own I cannot see the blue essence or other costs to buy them like I see in youtube videos. When I go into their profile and review the progression I see an unlock option that only asks for Gold Riot Points.
Is there something I have to do to get the ability to buy champions using only Blue essence?