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
Peeron: Train Rail Crossing for RC Trains (#7996-1)
Ultimate Double Crossover
4DBrix - Train
Track Planning for LEGO® Trains, Part 3: Custom Track Pieces — Monty's Trains
4DBrix - Train
4DBrix - Train
Ultimate Double Crossover
Lego City 7996 Double Crossing - Brand New - Railroad Retired Factory Sealed 5702014499041 | eBay