Depends on the age/condition of your 3c. Have a word with David or Darren Parkes, they have a business at Saville Tractors (Bearley, Nr. Stratford-upon-Avon). They only supply new stuff but you might have a shock at prices. I did a complete kingpost, kingpost carriage, all bearings, seals and bushes for less than £500.00 for my 3CX. 01789 414165. They ship all over the world and what they don't know about 180 degree machines you could write on a postage stamp.
Also be aware that if your 3C is very old it will have that awful ram as mentioned in another thread in which case I wouldn't consider s/h.
Hope this helps. - Scooby