Here are some for about$35 a piece. there are some lowend ones out there but you need be careful they are not 1/8 pitch.
http://loosescrews.com/index.cgi
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk