The ya sure thing is part of our non-dialect here in Washington. I know I say it. In fact, I betcha we almost never say a plain yes or no here. I personally do not say the words all together, but many do, and it is their natural way of speaking...

Ya betcha would be even more of a yes I believe.

Do you want a cookie ? Ya sure.

Do you want a chocolate chip cookie? Ya betcha.

Do you want a chocolate chip cookie with ice cream? Ya sure ya betcha.

For no we say na I think. I doubt I really ever say no. Naaa..