Redesign of shopping gamestate

I've redone shopping so it matches what we saw in the episode.

I've got a couple of issues with fonts though. Is it possible to re-size and centre text at the same time? If not, please can we have a font half the size of 'big' and another a quarter the size? 

Secondly, when a prompt is displayed, the font on the selling screen changes too. I can get it to change back afterwards but it still looks odd.

I think I should also reduce the size of the text on the purchase screen.