Peeron: Train Rail Crossing for RC Trains (#7996-1)
Trixbrix Double Crossover R40 compatible with LEGO TRAIN | eBay
4DBrix - Train
Ultimate Double Crossover
Ultimate Double Crossover
Bastens - We are lucky enough to have one of the LEGO City Train Track Splitter 7996 which is now retired. That being said I wouldn't recommend spending over $250 to buy