Wow Mashi that must have cost a lot!!
Oh no, we had it on script!!!!! One time when we ran out I did have to pay for a can because I forgot to get organised and had to pay for it, hence knowing the cost. After that we made sure to always fill the script with the same chemist near our house and they were really good with advancing me a tin if I forgot my script - so could go in, they would give me a tin and when I brought my script in the next day would give me one less, iyswim.
With the taste, my DS was 5ish months when we started it and it took a few weeks of mixing it with his regular formula to get him to take it. Doing it that way, with the aim to go onto the Nutraigen full time is not so bad because once they are used to it, they don't know any different, as long as they were young enough to start with - the Nutraigen website even suggests starting before 6 months if they are going to be on it FT. If you are using it sometimes and the other times BM, then it will prob be much harder to get LO to take it - Liz has experience with that I think!