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Riot Games has decided not to leave players guessing about the upcoming sales for League of Legends. Today they announced the full list of champions and skins going on sale in June.
They didn't reveal the exact dates that each champion and skin will be available at discount. However, even this rough timetable is helpful. If players know that a sale is just weeks or days away, they can hold off on a purchase.
If you want to narrow down the schedule a bit more, this spreadsheet might be helpful. It notes when each champion and skin was last on sale. The longer it's been, the more likely a discount is incoming. However, it's only a rough guide. Note, for example, that Jinx won't be on sale in June even though that champion's gone without a discount longer than several other characters that will be offered on the cheap.
When players buy a champion or skin at full price right before it gets a discount, Riot's customer service has been known to refund the difference. However, because they've published the full June schedule, they won't be offering these refunds throughout the month.