Ok 635.80…
665,00
20 characters…
go on,hah… already in 1 usd range
Already approaching 
635.84 what guessing thrill…
Okay then, 635.86 maybe?
only x no doubles? can it be 2 number 6 in number?
Like 635.46?
Or 635.67 ?
Cant reply anymore, so eddit that one post - 635,96
If its about discount - mb 635,49?
Ok, then I go to 631.07 
$635.81, might as well have another try :).
635.82 in the meantime
If this has been won already what was the correct answer?
Perhaps around $695.99?
pretty sure Yao stated somewhere in the thread that the x is not repeated so it can’t be 695.99
My guess would be 645.98$
$635.19 that must guess
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$615.16
let’s do it.