>>45499066Well if it's nostalgia moreso than profit you should just stick to the SwSh sets (Sword and Shield, Rebel Clash, Darkness Ablaze, Champion's Path, Vivid Voltage) those are recent so they're more available and therefore cheaper to collect barring Champion's Path since it's a premium set
If for some reason you're not a fan of Gen 8 though you can invest in Sun and Moon series, Ultra Prism is still a very hot set even after it rotated into Expanded and still has quite a few $20+ cards, Hidden Fates of course is loaded with money cards since it's another premium set, Team Up and Cosmic Eclipse are also good sets to invest in if you can get cases online
XY series isn't that great except Evolutions (temporary hype), Roaring Skies (couple decent cards), and Flashfire (basically Charizard or bust)
BW era is basically the Plasma series of packs plus Dark Explorers, every other set is underwhelming
>>45499111Well usually you go to LGSes or Amazon/Ebay for boxes, but I also reccommend Gamenerdz (oftentimes lowest prices around) or Derium's (Derium's lets you trade in bulk for new boxes)
Hope that helps
