Not sure if anyone is looking for any captive spacers at the moment but found these for a very good price £18 http://www.ebay.co.uk/itm/251951029486?ru=http://www.ebay.co.uk/sch/i.html?_from=R40&_sacat=0&_nkw=251951029486&_rdc=1
Very easy to fit. Put some on mine and replacing the rear wheel was so much easier. No more dropped spacers while jiggling the wheel into place. Bit of overkill for a road bike really but I'm very happy with mine.
I know the feeling! but the amount of times I cursed my old spacers dropping as I lifted the rear wheel in on my own grrrr!