They don't sell any at the brewery, but generally there stuff is really cheap at stores. Trop can be found around town at gas stations and grocery stores for $10-11, Athena is usually a buck cheaper. If any 750mls hit distro (been awhile since it happened) they run $12-16.
Per GA law, the brewery can only give bottles to go as "souvenirs" if you do a tour. So generally, when they have smaller batch/limited bottles, they use that as their release. If they have a special "tour release" with limited bottles when you are around it would probably be $40-50. For example, when "Emergence" was released-wine BA Sour--for $45-50 you got 2 bottles, a glass, and 36oz of on-site sampling of whatever was available. It's a good place to hangout, super chill.
They may offer 6ers of Trop or other cans as a "tour package" when there aren't special bottles, maybe even crowlers. I am not real sure, I usually just go for the special bottles.
Edit to add that as far as I know there won't be a special release the 25th, but I would still go by.