[Shameless plug]
It's for precisely that reason that I began
www.cavesurveys.com,
but I've not had many people advertise their surveys yet.
I suppose once we gain a 'critical mass' then it might take off.
[/shameless plug]
The idea of the site is that a knobbled version of the survey (much simplified, compressed and encrypted) is presented on the site for simple viewing.
This enables the viewer to check that it is indeed the correct survey.
Then immediately underneath is a link to the publisher, in order to obtain a proper copy.
It's written in as simple HTML as possible so that the widest range of browsers can view it, and it is multi-lingual. (I'm currently awaiting checking of my Russian translation) До свидания