All the lower prices seem to be either too cheap (yes - I did look at eBay), or sellers which have at best chequered reviews (at worst, simply appalling). There's one based in Hong Kong, another seems to be in Spain. And one price comparison site lists only sources which are significantly more than full Apple retail prices.
Also noticed listings which had ambiguous descriptions - one could be read either that the offer included the case, or that it was ONLY for the case. Or, after several of the real thing in eBay or other multiple listing sites, they change to other models (old version, non-Pro, etc.).
I'm not expecting to see them truly cheap - just comparable to regular USA discounted prices.