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Considering they don't have any in stock in the same size & clearly trying to sell off some narrow bars they have left over in 38 & 40 I wouldn't consider these. Just like a retailer wouldn't price match to a store that didn't have the same size/colour in stock at that time.
Cheapest you can actually get these are from Sigma @£400...£300 is 25% off if my maths are correct?
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Admittedly didn't check all sizes, although they do have 25mm rise in 42cm..... for £150
Plus unless you have a Venge Vias, you'd likely much rather pay the £200 for the standard S-Works carbon version and worry less about the fact your stem clamp isn't designed to support a handlebar clamping area with little of the actual clamp area left....
Its always a good idea to preclude a for sale thread with a quick search of how much the product you are selling is currently retailing for at its lowest price from a retail outlet.
And then likely take off at least 25% for the fact you will not have warranty, or any guarantee of return should the product fail.
In this case:
https://www.bike24.com/1.php?content=8;product=182807;menu=1000,4,133,31;page=6