There's a couple of 3 speed Broms on ebay right now, going cheap.

If you want a good folder for train/bus or even boat use, they are
worth trying for.

I love mine! Add the front touring pannier and it carries a huge
amount of stuff for shopping, it's now my preferred shopping trolley.
(Quite literally, I take it into the supermarket with me, half fold it
and roll it round on its castors with the bag attached, putting the
shopping directly in the bag. Leave market, unfold, ride away....)

Zebee