What one finds utterly proposterous, the other finds a bargain. And isn't that part of the charm? Finding a good bargain. For you that is?
I think GBP 340 for a Canadian 32 pattern is not too bad at all. Seeing an RAF (green) one fetches over GBP 1000...
There has been a yellow 32 pattern an David Farnsworth' site for ages. Unfortunately, now I want to check his price, it is reserved. The price is no longer visible. You could ask him though....
What I'm trying to say is the Bay has great bargains and great rip-offs. It's up to you to choose what to buy and what not to.
If the item you find too expensive sells in the end, then apparently it wasn't too expensive (for someone else).