The most valuable sealed items trace back to the same early sets that produced the record-setting singles
That saves you $24.71 on a 30-pack box, bringing each booster down to under $5
Palafin 151/131 PSA / BGS / CGC / TAG Slab extended art case from Prismatic Evolutions Set Pokmon Extended Artwork
So there : Standard Holofoil, Cosmos Holofoil, like Shining Mew and - I think - Shining Magikarp and Shining Gyarados (Awakening Legends), Embossed Foil Treatment, for Shining Pokmon (Darkness, and to Light) and Shining Magikarp (Unnumbered Promotional - Pokmon Card Fan Club 600 GET point prize), Reverse Holofoil (1/2), for 6 cards of Southern Islands sheets, Reverse Holofoil (2/2), like Charizard, Entei and Pichu from Neo Premium File 2, Special Holofoil, only on Ancient Mew in its different releases
Suffice to say, if you think you have a Pikachu Illustrator knocking around somewhere - you can see what it looks like below - then it's probably worth getting it valued no matter what state it's in