I made a little extra money and thought I would pick up a tele-converter for my 40-150 2.8 and was wondering if I might not be aware of a better option, it seems to be $350 U.S. at adaroma which might be the going price?
If you are not in a hurry, Massdrop has had multiple drops for the MC14 at $189. Sign up for Massdrop (its free) and then select "request" under the MC14 and you will be notified. Massdrop: Community-Driven Commerce
You can also check the Buy&Sell forum here and check on ebay
I got mine on Massdrop recently for $179. In fact, I bought it without even having a lens to pair it with because it was such a great deal. Then, I found a reconditioned 40-150 Pro on getolympus with a 20% off coupon and snapped it up. You know, because I had to make use of that teleconverter! Bwaaahaha...