While most of the meds mentioned are readily available at local pharmacies, it can sometimes be challenging to find some, especially estrogen pills due to the Progynova shortages. This page contains some links on where to order them from at home.
You do not need a prescription for these meds, even if the site says prescription is required.
Price per month is calculated at 30 days, and per year at 365 days, using:
$$\text{Price} \times \left(\frac{\text{Days}}{\text{Tabs} \div \text{Dose}}\right)$$
Vials cost €50 with around €28 for shipping. One vial lasts a year on monotherapy doses. You can ask AstroVials to send them in stealth packaging to avoid any chance of Customs interfering. In case your vial gets seized or breaks in shipping, you can reach out to her and she will either refund or offer send you another one.
Note: Not only is Gravibinan not recommended for reasons talked about in Sources of HRT, but an EEn vial from AstroVials, which is the primary recommended method, costs only Rs. 26,000 a year (conversion rates vary). There is no real reason to go with Gravibinan.