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
4DBrix - Train
Lego Double Crossover Track on Sale, 52% OFF | www.geb.cat
Lego Double Crossover Track Clearance, 59% OFF | www.llibreriafosterandwallace.cat
LEGO MOC Costum Double Crossover by Brick Forge | Rebrickable - Build with LEGO