If you can find someone in Portugal to sell some to you, I imagine you'll save quite a bit (not going across a border, even a porous one, always saves money). OrchidWire - Portugal - Orchids might be a start.
Lusorquídeas - Catasetum
ditto :)
The promising site seem to be
Orquidea Algarve

---------- Post added at 03:46 PM ---------- Previous post was at 03:40 PM ----------

And possibly occasionally Orchid Plant Store / Jardim Orquidea although they are on an island, and islands are expensive for postage.

---------- Post added at 03:49 PM ---------- Previous post was at 03:46 PM ----------

If you're patient, flasks ship fairly well and are sometimes cheaper than plants. But the barrier to successful growth is higher than an established adult.