Thanks. I've emailed them with a series of questions in an attempt to check
their legitimacy. I suppose they could just be a stereo/alarm installer
outfit.

Even if they're fishy, I might still include it in the FAQ, with a big
warning that I can't determine if they're legit or not.

I emailed that site asking a few simple questions:
1) How is it that you are able to obtain these codes?
2) Are you an authorized Honda/Acura dealer?
3) How do you determine that a code requester is the legal owner of the
radio?
4) Where are you located (state, city)?
5) Do you operate a brick-and-mortar operation under another business name?

So far all I've got back is an "only the owner can answer those questions"
reply, and the owner has not yet responded. In the same reply they asked me
to add a special link to the FAQ so their Google rankings would rise. (I
didn't add the link).

I'm not prepared to assume they're legit because they have absolutely no
way of knowing if you're the legitimate owner of the radio. You could swipe
somebody else's radio, pay the site for the code and resell the radio to an
unscrupulous body shop.

What I also discovered just today is that Acura dealers (in Canada anyway)
have a policy of NOT charging you to retrieve your radio code, provided you
show up with the necessary documentation and numbers and they don't have to
pull the radio. Cool or what?