Selling items as pairs or singly

[chinookpr2]

I have two identical microphones for sale. As they are usually used as stereo pairs, I want to offer buyers the option of buying one or both.  There doesn't seem to be a way to do this.  If I list them both separately, eBay flags the second one as "duplicate" and won't accept the listing.  If I list them together, there doesn't seem to be any way to sell only one.  Any suggestions?

[wastingtime101]

To list as singles, create one listing with a quantity of 2 available in the quantity field. Make sure the pictures don't show both mics or people will think they're getting 2.