Football ticket question: Alabama v LSU

Hi guys

I’m travelling over from Australia for the LSU/Alabama game on 5 November.

It’ll be my second time at Tiger Stadium (my girlfriend’s first). My previous trip was for a home game against Arkansas where I’m pretty certain I just purchased tickets directly from the LSU website.

However, being that it’s Alabama, I assume that option won’t be open to me this time around. Looking on the major ticket exchange websites it also appears to be the case that the get-in price is at least $200.

My question is - when is the best time to buy? And from where?

Apologies if this has been asked before. I did a bit of a search but could not find anything specifically on point.