I'm looking for a folder to keep on my sailboat. I plan to use it to explore the towns and villages I visit in
my travels. The best choice seems to be a Bike Friday or Brompton, but I don't want to spend a lot until
I try the sailboat-folder concept out a bit. So, I'm looking at some of the cheaper brands/models and am
willing to compromise. If I find things work out, I will probably sell it and upgrade.

My priorities are:
1. low price
2. small fold (16" I assume)
3. corrosion proof (alloy I assume)

There seem to be lots of good choices (Greenzone, Solorock, etc)

Any guidance appreciated.