us viewers will have to pay up to $ 100 -lrb- £ 67.48 -rrb- to watch the fight .
hbo and showtime confirmed recommended price of $ 89.95 -lrb- £ 60.70 -rrb- .
hd surcharge of $ 10 could be added on by tv providers .
sky box office will show fight in the uk at a cost of £ 19.95 .