My cat Bugsie has recently been diagnosed with hyperthyroidism too. I plucked up courage to ask the vet about their policy on issuing prescriptions after starting a thread on GN. My vet said he would buy on line for his own pets if the need arose. They charge £18.50 each time, which will be every 3 months. As Bugsie's medication is for the rest of his life, it will still be an enormous saving. For 100 tablets on line is £44 as opposed to £121 at vet with VIP discount. That is as well as blood tests also every 3 months, I am pleased to say that his test results are now normal and he is putting on weight.
I have been interested to see that your Tara has a syringe of medication, and am pleased that her results are also back to normal. Bugsie has Vidalta tablets which must not be crushed but hidden in food. I bury it in a teaspoon of pate food, but sometimes, like yesterday, it takes up to 6 attempts. He is able to lick around the tablet and leave it in the bowl. I found giving by mouth with one of the syringe-like tools very difficult. He would swallow and I thought all was well, then spit it out later.