Go on Monday with some friends. They release each new batch on monday. they are sold out completely by friday (cases and single cans) On the alchemist website there is a list of locations where they sell. If it says they have cases available they will, first come first served.
I got there at 3pm on a Monday and got one of the last three cases at the only location on the list that said cases available when I checked that morning. The last two cases had been snatched before I had been checked out.
I only tried to buy one case, I don't know if there is a per person limit. You should call and check how many friends you will need to reach your goal. Good luck! It is worth the planning.