obtaining packing list items during SOPC or Airborne?

[conductingCHAOS]

First off I'd like to say I know that "there are no magic carpets." No piece of equipment is going to get me through SFAS but there are still a few recommended items I'd like to obtain beforehand such as a waterproof map case, and other items recommended in the SFAS advice thread and Warrior Mentors book.

Going in as an 18X, I'm not going to be allowed these items at BCT / infantry OSUT. I thought that I might get them ahead of time then have family bring them to me at graduation but I'm not sure what all I'll be allowed to have at jump school either.

If I don't get the items ahead of time then I'll have to acquire everything during airborne at Fort Benning or SOPC at Fort Bragg. Seeing as airborne is only 3 weeks, I can't imagine having much free time to visit the PX or if I will even be allowed to do so.

Will there be time during airborne or SOPC to visit the PX? Will the PX have most of what's on the SFAS recommended packing list?