I have the Past and Future precreated decks from the Past & Future expansion (ironically the ONLY cards I kept from way back then, I bought the expansions and packed them away). Also got a bunch of Past & Future cards in a large lot I bought last week. I never came across booster packs of the expansion however and the precreated decks always have the same cards so I only bought the two decks. The most valuable thing that came of them were the Body/Mind/Soul cards that could be either of the three and changed at the beginning of each turn - made drawing and distributing power a lot easier.
It was a pretty good card game, easy to learn and fast to play, just came out during the wrong time. Many a friend would try to knock out my assortment of Ayakashi Sisters (particularly Prizma) to no avail. Then there was one card where if you won a JKP challenge all the other player's sailor senshi would be knocked back to level 1. Play that late in the game when they already have some damage and then it was killin' time.Super high level enemies with massive counterattacks against entry level senshi - no contest. I have a Catzi in another large grouping on the way right now, then the posse will be back together.