That unit actually sold for about 55 cents per credit. The auction had the buyer paying m-fees which most auctions for WM do not have as well $395 in closing costs which when added in bring it to about 54 cents.
Its true WM prices are way down from one to two years ago when they were in the 70 cent range. Now 50-60 is the norm, depending on how many banked credits are included.