The SOD (thanks to mpn_daedalus as I'd forgotten what that stood for!) is available from your Honda dealer and is fittable in about 5 minutes flat. Just ask them to order one in for you, part number is 76209-SMG-E01.
Use a screwdriver to pop out the mirror and then behind it you'll see the clips which hold in the plastic cover. Whilst pulling the cover away just prise the clips and it'll pop off, then you'll see the SOD which can be replaced.