Not a decimal problem - a price tracking issue
As the original spotter of the problem I can say it is certainly a "price tracking" type of problem. In this case the idiots are tracking two of their own products - they probably meant to track the Amazon offered listing.
On Friday the Amazon one jumped from 899.99 to 999.99 and that's when the independent seller's listed items went bonkers. I notified Amazon and they were not in the slightest bit interested saying (correctly) that pricing was a matter for the sellers themselves. I think the more expensive one peaked at £1.2M before they spotted the problem, perhaps tipped off by an El Reg reader.
They have "fixed" it now so the prices are "only" 15% and 70% respectively more expensive than Amazon's own listed product (which is the highest spec model). I bought that one, from Amazon. It's very nice so far but I would not value it at a million.