For my UK trans men. Does anyone know the price difference from the pharmacies?

my GP won't info share, so I have to take my private prescription to a pharmacy. (I'm with GHC) I've been told to go to tesco or Asda as they're cheaper but my local tesco can't order the gel. my next local pharmacy I can use is boots. How much more does it cost? if its high then I can go to the next city and check with their tesco.