Paul Tomblin wrote:
[ Quiet Technologies "Halo" headset]
And the web site has no information on getting new ear tips, and every
time I email them about how to get more ear tips they either say "we're
just about to go on vacation, contact us in two weeks", or they ignore
me completely.

One of the photo captions on http://quiettechnologies.com/index_003.htm
says "World-wide availability of ear tips. These are standard products
available either through Quiet Tech or most audiologists and hearing aid
dispensers." Googling "foam eartips" reveals several possibilities. It
might help to go to a local audiologist and/or music shop (the ear tips
are apparently also used on stage headsets used by musicians) so you can
try different kinds and see what fits on the headset and get a couple.
Then you'll have a part number and can order them from whoever is cheap.

On the other hand, you might argue that for $400, they can afford to send
you some eartips under "warranty" or in the interest of good customer
service.

Standard disclaimers apply; I don't get money or other consideration
from any of the companies mentioned.

Matt Roberds