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Here is what looks like a great deal. But look closely. A decent price but the shipping is nuts!
Quote: C $50.00 (approx. US $48.64)
49mm Lens Macro Reverse Adapter Ring for Pentax K PK Mount K100D K200D K20D K10D | eBay
This is hard to understand, when there are many other sellers offering the same thing with shipping at under a buck or for free.
And the listing shows 11 sold (at the time of this posting).