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