70-75k you should able to push through, std price is 90k, choose the least crowded hours, can use cityheaven to monitor status.
you don't have to ask for the lowest, just the comfortable price you willing to pay, , if you feel later, that you have given little more, just take it as a tip to the girl, she will feel nicer and treat you better.
Ask the guy to recommend a better look and better service girl, still depend on the availability, of the girls.
He is more willing to give a better price if you let him choose the girl for you or give a new , inexperience girl to you.
if you given you a bad choice, ask him for future discount next time.(if you still willing to go back, haha)
A little discount i feel is justifiable as the girls always turn out not to your expectation.
only if you willing to pay 75k, hisyo girls always appear to be as real as the girl you pictured.
jyoutei is much younger but hisyo is still better look.