Hm okay so I tried that like so:
"$"+self.item['reg_price']
but got the error
Error binding text of price_label to "$"+self.item['reg_price']:
cannot concatenate 'str' and 'int' objects
so I wrapped it in a str() function like so:
"$"+str(self.item['price'])
but now I’m back to the original error
ValueError: invalid literal for int() with base 10: '$25'