Where can I get brass house letters from?

I need a letter 'C' to go with the number of my house - 51c but I can only find numbers and occasionally the letters 'a' and 'b' in shops. I don't have the money for a custom-made sign. What shop, high-street or online, has letters beyond 'b'? I live in the UK.

I've been trying to solve this one for months so any hints will be gratefully received.

Answers:
EBAY.com here is a link to a 9in polished brass "C". Hope this get me best answer! Also different sizes below. How much would it cost to tear down part of my wall and build a support beam?

anyone give me some ideas on painting my rooms and what colors u might choose?

Brick fireplace, teal carpet, burgandy furniture. Would like color on walls.suggestions??

When installing granite countertops will the seams be visible when the install is complete?

I painted 2 walls today with Behr eggshell paint in classic taupe..?

Favorite decorating / remodelling website?

i need a 28by36 concrete foundation poured on moosehead lake in maine.?

what should I paint the family room?