'tis indeed a bit steep to say the least. Last fall I emailed a few US distributors and $295 with a 5 week wait seemed to be the average with the exchange rate at the time. I recall the mount part alone being a good bit less, but still too much for me.
I figured given the OP's location, they might have better luck finding a distributor that actually carried them and could get away from that nasty MSRP. ...still looking for an MV coupon here...hehe.
Edit: "Basic Adapter with Interlock" is the main adapter piece I am referring to. They still mention the pieces being available individually on that link, but no longer list the prices for each part as I saw last year.