Look - I don't know shit about where to buy these AES cases, but I suggest at least 1 more layer on top of these fuckers, as they scuff easily - Gotta protect the investment in your investment.
My suggested storage method for an AES game: Cart in original snap case, snap case inside one of these sleeves, no less than 6 mil plastic bag to stop from scuffing, then a white cardboard/corrugate slip case to stop UV light from fading the art.
Oh you're in Pennsylvania - dry as shit in the winter, humid as fuck in the summer? What kind of room you keep these in - climate controlled? You might want to look into a large safe deposit box at your bank.