Rwd, List the component on Ebay and on Audiogon. On Audiogon, reference the item number (auction number) on Ebay using a "tagged url" so that interested individuals can see the component, description, and/or pictures. You can actually write the description for either site, and cut and paste the description onto either/or site.
On Ebay, clearly state that you are using other forms of advertisement in addition to Ebay, and that you reserve the right to end the auction early at any time, for any reason.
It is totally legal under Ebay guidlines. If you decide not to sell, or to not complete the auction on Ebay, you would simply cancel any existing bids, end the auction early, and your reason would be "the item is no longer for sale".
That terminology is actually in the Ebay drop dowm menu.
Hope this helps, Ed.