Since you mentioned Shure, you should try to contact either
Amac or
Venuetech and ask about the model in question. Wouldn't be surprised if it costs upwards of $2,000 apiece. Shure products are of very high quality though.
Katrangi should have
cheaper products but of much lesser quality.
If you're looking for a consultant, try
21dB. They also supply audio and acoustic equipment and offer architectural design solutions, though I don't think they carry audience response systems.