Hi, is there a way of buying past seasons? I saw you could access them if you buy the Beyond Light Deluxe Edition but if you already have the expansion, will there be a discount or will you have to pay full price?
You can check your platform's store to see if they have the Delux upgrade pack which upgrades you to the Delux version of Beyond Light.
Other than that there is no way to get past seasons.
Note... Bungie will most likely add other ways to obtain past season exotics either through the kiosk or general drops at some point.