In this quote
‘Eleven Sickles,’ said Stan, ‘but for firteen you get ’ot chocolate, and for fifteen you get an ’ot-water bottle an’ a toofbrush in the colour of your choice.’ Harry rummaged once more in his trunk, extracted his money bag and shoved some silver into Stan’s hand.
We learn that there are three options for the knight bus.
Is there any canon (or pseudo-canon) sources for which option Harry paid for?