I have been looking for one for quite sometime now. The ones available in local aren't close to even being a copy of Mugen Spoilers. But since no body here has a damn clue of what's wrong with these, they keep adding them to their cars.
One spoiler I found is an exact copy of Mugen Spoiler, and it doesn't really cost much ($135). The only problem is I don't know if it will fit City or not. Its shown fitted on Civic only: 52 06 07 08 09 10 Honda Civic FD TYPE RR Spoiler MUGEN: eBay Motors (item 150458061309 end time Sep-18-10 00:58:47 PDT)
This looks "exactly" like a mugen. The ones we have Available here have the missing 'base' that you see in this one. It just looks fantastic.
If someone here who is the owner of a civic could give us some clue of whats the exact width of the trunk, we could probably calculate the difference and import this thing here.