Every so often I run into a to good to be true deal like this on Amazon, and almost always it's cancelled after I order (though I did once score a used NEC 30" monitor for about half off, that is still with me and working well). I really don't understand why some sellers do this. What do they get out of this? Maybe they're playing some game where they're trying to get other sellers using automated listing software to lower their prices? I don't know.
I think about doing this every now and then. I would be the lowest price, so I initially set a crazy low price, $1, and that triggers the camel price watch emails, then I raise my price so people go to the ad, they have some interest in the lens, and they seer my price which is the lowest, and they buy. I don't do that though...
Amazon has lots of clueless third party sellers. If they get many complaints or cancel many orders, they are removed.
They have an 84% positive rate... they aren't bad, they just err'd this time.
Upgrade path.->means the former was sold for the latter.
XS->60D->5d Mkiii:18-55->24-105L:75-300->55-250->70-300->70-200 f4L USM->70-200 f/2.8L USM->70-200 f/2.8L IS Mkii:50 f/1.8->50 f/1.4->100 f/2.8L->85mm f/1.8 USM->100L & 135L & 8mm fisheye for kicks