This was discussed a bit in MiamiSlice's pickups thread, but I'll post here as to not clog up his thread lol.
There's been some rumors that up to two more 3DS physicals are/were in print. William Kage (the dude behind Fragrant Story, one of the last physicals) discussed it on his Patreon. Is it possible that Video Game Plus' reprint of Pac-Man Party and Tales of the Abyss are these last two carts? Though, this tweet also suggests VGP has more carts incoming, but they could be preexisting UAE copies or other fresh new prints, in which case I'd guess one of the latter is the last physical.
Also get Tales of the Abyss, it's a pretty good game.
Edit 2: an extra, unrelated thought. If you have the chance to get one of the more expensive games cart only but you collect CIB, would you get the cart only and hope you're lucky enough for a case only listing to appear or wait for a good price case + cart?