I see your listing on ebay says a delivery between 28th July to 4th of Aug. Have you actually got these yet. If not you may want to put a disclaimer on your listing in case people are expecting delivery by then.
In case any one reading this is unsure of the ebay seller, I ordered a C5 from this seller last year and everything was fine. he is a trusted seller. (I have no affiliation with this seller by the way).
EDIT: It has just come up with out of stock on the listing. Missed that. Sorry.