Bike / Tricycle - Amsterdam

Hi!

I'm looking for long term rental adult tricycles (driewielfiets) or even for a second hand one that isn't too expensive.

Does anyone know where I can get one in Amsterdam?

I'll be staying for 5/6 months so I don't want to spend too much.

I have terrible balance and couldn't cope with a regular bike in the crazy streets of Amsterdam...

Thanks!