You can still find minis out there. I got my kid a anti hero 7.1, thunder 143s, 52 spit soft d's and the slowest shop bearings. Star Wars grip was also essential. We put it all together and he's hyped on board maintenance, knows what bushings are, etc. But he's 3, and right now just wants to wrench on it and put on stickers. More in to his bike. Not forcing his hand.
I guess my point is putting together a custom complete they picked out is a good experience.