What kind of connector is this, and where would I find...

[PeterB]

... a switch for it?

Here are the connectors at the ends of the cable (apologies for the crappy photos):

http://i.imgur.com/kSXr2pH.jpg
http://i.imgur.com/OGbZjsH.jpg
http://i.imgur.com/ecYvvv2.jpg
http://i.imgur.com/KNjampZ.jpg

... what I need: an additional cable or two of this type, with these connectors at the ends, and an A/B switch to switch between two inputs using these cables. Preferably cheap, of course.

TiA