my setup consists of this:
BEHRINGER: MIX800
my laptop hooked to my tv
You will need to find your own KTV/MV on youtube or download it yourself
I personally have my own youtube channel with a big list of KTV, then on your laptop/pc you adjust that all sounds should only be coming from the left side of the video thus the singing is gone! or in some cases, some KTV already has the vocal part removed
its the cheapest way but it isnt professional like one of the links above or the ones you would find at karaokes