I got Witch Mercy and with hours to spare! Seriously, they shouldn't pressure players to get costumes, they should let them become buyable only after the event is over. Saving up to 3000 coins is better than it becoming locked period.

the game gives me the new roadhog's skin and im happy…
but then the VERY NEXT LOOT BOX! THE SAME SKIN AGAIN!
AND THE NEXT ONE, A LEGENDARY UNLOCK, BUT FOR CREDITS!!!