I'am a newbie , so this my first time doing this responding,but my wife bought a Cayne Rambler 3 at a flee market for 100.00. Use for transport from train to hospital front door.....Like yourself I couldn't see spending over 400-600 for a bike, and I believe my wife said this seller had another Rambler 3 to sell...
I like it folds easy, carry's good, I'am 64 and the riding again in traffic (people) getting used to it all over FUN... Wife said i should get a helmet, thinking with FLAMES on it......
