Btw, I'm rereading this thread.

A few questions:
1. Why do you need a Brompton?
Can you get a cheaper folder?
If it's a "want", you can save more for one.

2. What folders are locally available in Portugal?
Can you get one used in the meantime?

3. Do you have friends in other countries that can help?
In Taiwan, they have clones that I can only imagine. I think Raxel bought a decent Brompton clone. Look at his threads.
In England, they have used Bromptons.
Singapore has a great mix of folders... Brompton, Birdy, Tyrell, etc.
USA, it's bike Friday, dahon, tern, xootr,

4. What are your specific needs? Commute distance? Size? Baggage?

I might recommend just getting a cheaper folder for now.