If its for walk rounds, I've got some custom make in ear defenders. I went to a local Audiologist who took a mould of my ears. The defenders were made from silicone and have a filter embedded to allow voice to pass. Very comfortable to use and the total cost was £60. If you are flush, a few friend of mine have the electronic versions, but they are £700.
Horsham Hearing Centre
22 Worthing Road, Horsham
West Sussex, RH12 1SL
Tel: 01403 218700
Fax: 01403 218701
http://www.ormerodhearing.co.uk/prof...earingservice/