Moped ignition barrel?

I have recently bought a x reg 50cc sym jet for getting to and from college and verious other things. However the guy I bought it from has lost the key. I would like to know if there is a way I can get a key made for the ignition barrel and the seat storage or would it be cheaper to buy new all round.

If anyone can answer my question could they provide a link to a web site or a way of getting prices and contact details.

Thanks alot

Joe.