Releasing the Game Panic 3 / BLT Blast all original homebrew 2600 cart at CORGS this year. Until I hear otherwise this is the second ever homebrew double ender. Although new double enders with reproduction games have been around.
BLT Blast is a tiny shooter that encourages risk by making you taller as the bonus goes up.
ROM here: https://theloon.itch.io/blt-blast
Game Panic 3 is a Game & Watch / LCD game-esque cart collecting game spanning 16 unique floors
ZeroPage Homebrew showcased it here: https://www.youtube.com/watch?v=eNjowHGMyAk&t=4375s
Going price is $55 USD at the show. Includes developer autographed two page manual, sticker and universal game case with custom insert.