Kind of out of the way, but not too many K-Karaoke places are closer! The owners were super, super friendly and kept the place open as long as you were there.
We had five people for two hours and it was $40, which is reasonable for Vegas--actually, it's reasonable for where I am from as well.
$12 bottles of soju (she has a few different kinds)
Free water as long as you're a paying customer.
Also, just to top the evening off, when we asked for the owner to call us a cab, she got her husband to take us back to the hotel in their minivan (very nice and clean; nicest cab you will ever get in Vegas ^_^) for $20.
I would definitely recommend hitting up this place--they have a pretty wide selection of K-Pop, J-Pop and regular old American Pop.
Don't be afraid if you're not Asian, I guarantee you will like it.