I love my BikeFriday, but I have to admit that it's not the easiest thing in the world to fold.

Dahon folders are easy to fold, usually 30-45 seconds, and faster after you have it down, and affordable too.

I don't have one but a friend has a Dahon and he rode it half-way across the country after hauling it on the bus for the other half! Folds really quick.

Although its a bit out of the price point you indicated, the Brompton folding bike is worth a look. I've had one for years - its easy and fast to fold or unfold...takes me about 20 seconds. Its well built (in the UK) and very comfortable to ride. I much prefer it to my regular three speed for city riding because the low center of gravity makes it easy to maneuver without any loss of efficiency, and I'm about 5'10". They hold their value too when its time to resell!

I have a Dahon and love it. I am 6'4" and I am sure it looks funny under me, but I am very comfortable on it. It's easy to fold, store and unfold and it's sturdy.

Dahon will be your most affordable solid option, most likely. This is not a true Dahon but is an old model that is licensed and sold under their name. I've had this one for a while and it is pretty bombproof. I really enjoy riding it on my local greenway and to/from the store. I ride it more than my mountain bike.

Dahon Boardwalk

The single speed is really durable / mechanically simple but you will be slower as a result - you can't pedal that fast going downhill, and uphill you have to work hard - this is a "slow ride" bike for sure. The coaster brake is difficult to get used to if you haven't had one since childhood, but it also has a front hand brake.

It has three latches - seat, handlebars, frame. Seat goes down on its post, handlebars swing down next to the front wheel, frame folds in half. 20" wheels, stows well and weighs about 30 lbs, I find it easiest to carry it by the back of the seat.

Another vote for Dahon. I have the 7-speed Boardwalk and it's pretty solid. You can spend a lot more to get a much lighter version, or one that will fold up small enough to get into a check-on bag on an airplane, but if neither of those are a concern, the price is right on the Boardwalk.

My answer is: are you sure that’s what they want?

I had a small Dahon and sold it a month later because it was hell trying to ride with tiny wheels on New York City streets. If they feel a bit uncertain on bikes, they should definitely test-ride before investing.

My vote is to buy a good used bike that’s full-sized and made of aluminum. Craig’s List is full of ‘em.