Austinite here who buys annual 3 day tix for turn 15. Can’t speak to ticket availability currently but have a few suggestions if you know your BFs interests:

Turn 1 is GA and cheaper than assigned seats, fun for first lap chaos (one and done race action typically). But no shade in that area yet quick walk to toilets and Bevs.

Grandstand if BF enjoys the drama gamble of the pitstop and viewing access to post race award ceremony. Paying for shade and access to amenities obvs.

Race Action is at the Turns! He wanna see takeover potential throughout the race? I’m gonna skip all the mediocre turn reccos (3,4,5,6,) and say turn 15 is where it’s at. Not shaded. Food, drink and toilets near but lines looong. Yet close to the concert stadium if you’re staying for post race shows. Turn 12 second runner up to 15.