
I dont think 300 series are uncommon now to breakers although I think the 200 could well be the same

, there are a couple of breakers on the web all depending where you are try these for starters

,
http://www.4x4web.co.uk/links.html#breakers
I am pretty certain you could get a secondhand one and have it fitted for way less than you have been quoted

.
PS: you havent been quoted for a gold plated one have you :p ?