I ran across these:

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ih=015&sspagename=STRK%3AMEWA%3AIT&viewitem=&item=250157802871&rd=1

They are $5.95 for 12 plus $2.00 shipping.  Still right at 50� each
(before shipping).  They require an 11mm wrench, though.

Mike

Paul Guzyk wrote:
> I also like using the copper nuts on exhaust, the ones that self-lock
> and have a 12mm head instead of 13mm.  While they cost $0.50 to $1.00
> each (depending where you buy them) they save you a lot of
> aggravation.
>
> The extra 1 mm makes a huge difference accessing the nuts with your
> wrench in the tight confounds of the exhaust system.
>
> http://www2.cip1.com/SearchResults.asp?Search=175129650&Search1=Search
> http://gowesty.com/ec_view_details.php?id=3882&search_phrase=exhaust%20nuts&start=
>
>
>
>> Copper for sure.  Pretty sure this was discussed in the last three months
>> and sources/links provided.
>