I was prescribed t3 by my private g.p and I want to Boots to purchase it. I couldn't believe how expensive it was. They were charging £95 for 28 days of lithothyronnine(20grams). I then went to my local chemist and they were charging £110. Both places were very helpful, but I decided to shop around. I then decided to go to Sainbury's chemist and they were happy to give it for £72. So, what i have learnt from this experience is you must shop around to get best price for medication.