Splitter Vans Where Can I Get A Headphone Extender Chord With A Splitter On The End For My Kids New Portable Dvd Player?

Where can I get a headphone extender chord with a splitter on the end for my kids new portable dvd player? - splitter vans

I have my children, a portable DVD player in the van for long trips, but has only a headphone. I know there are extensions and dispatchers, but they are an extension of the separator at the end, and if they do, where can I buy? Thank you.