Ours was £200 since we're currently in the UK. I could have tried to get it diagnosed through the NHS and have it done for free but that meant waiting weeks and I wanted to do whatever possible to try to keep breastfeeding. We had two osteo sessions as well which were £60 each.
Why are they saying you need osteo (or did you say physio) sessions as well? Our osteo sessions weren't for his tongue but to try and get him to open his mouth wider. I'm not sure if they worked, maybe the first one helped but I don't think the second did anything. His mouth started opening wider as he got older and it was just bigger .
Eta: the LC gave us tongue exercises to do with him to encourage him to stick his tongue out more. Basically just sticking our tongue out at him and encouraging him to mimic.