So as of may 21st, we can trade in vehicles to other premium tanks in terms of discount. But say i want to trade my e75 TS for bisonte. And i fail to buy bisonte before trade in event ends. How can i buy it for the discount price, do i have to wait for it to be back in premium shop or will i be able to buy it at discount whenever i have the money to buy it?

TL;DR I trade tank for tank. Event ends and tank is no longer buyable I can still buy it because discount?