Where can I find replacement string for MAC McCULLOCH MT1000 string trimmer?

Where can I find replacement string for my MAC McCULLOCH MT 1000 trimmer. It says to use only McCULLOCH YELLOW 6 x 10" REX P/N 302609-33 HEAD, but can't find it anywhere.
David, June 2005


done
McCulloch Corporation is committed to providing quality, dependable products and superior service. That's why all McCulloch products are supported by a large network of service dealers located throughout North America. To find a service center near you, please call 1-800-521-8559. I was looking for the same items. They come in a 5 pack currently selling for 5.49 per pack plus shipping.

debea, July 2005
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