Userscripts.org

It would be great to have this as a script.
Currently you can search by price but this doesn't include delivery costs for used items. If you pick 'free delivery' and set a max price then Amazon treats this as an OR (under that price OR with free delivery).

A) For example this audiobook - put in under £5 as the price, pick audiobook CD (to exclude kindle) and free delivery and you get results including CDs like this - http://www.amazon.co.uk/Impossible-Dead-Ian-Ran...
New price >£5 and used price <£5>

B) An alternative to altering the way the search works would be to have the correct Used price on the search results page (used price including postage)

C) Even better than B) would be to be able to sort results by used price including postage - or to be able to search Used items only (Amazon.co.uk removed this functionality a few years ago).

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The Total Used amazon.com scripts on this site don't work on amazon.com and don't seem to have ever work.
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Ideas for where to start off on ideas for A), B) and C) would be very welcome!