You've boggled at Realdoll (yes, who would pay US $15,000 for what is basically a masturbation aid?) but the internet, that wonderful tool for bringing us into contact with things that make us wish we could scrub our brains out with dental floss, isn't through yet: these people will happily sell you an artificial corpse:
Each corpse is Hand-Made to your specifications. The Corpses For Sale page contains the variations that you can choose to make your corpse unique from all others. You can choose the Hair Color, Skin Color and the approximate Degree Of Decay. If you have any special request please E-mail me or note them on the order form and I will see that they are incorporated in the construction or notify you if it is not possible.(I notice that the options on the "order your corpse" page do not include "orifices — firm or squishy" so we're safe from necrophiliacs for the time being.)
Meanwhile, on a more serious note, The Observer says that up to 55% of death certificates filed in the UK are inaccurate or incomplete.