Grachan Moncur III's Evolution. I paid about $25 only to discover upon its delivery that it was the cheap "Masters of Jazz" version. I returned it and was partially refunded. I did not ask for a full refund, as I felt some of the blame was on me for assuming that it was the Blue Note domestic version.
A bad way to start, but I have never had another bad experience. Yet, anyway.
My most recent purchase that has arrived was a copy of Eddie Costa's House of Blue Lights.