I know some pharmacy's carry simple ones(at least in Canada), or you can order one online at http://www.medicalert.org/
go to laurenshope.com they have the cutest bracelets!!
stickyj.com also has alot of cute braclets. Go to Google and search for medical id braclets. There are a ton of sites to look at and alot of them have different styles from one another.
StickyJ's med bracelets are ADORABLE! I always bought the legit ones but I was barred from using them because I was scratching myself when I flopped around during low-blood sugar seizures. StickyJ has these bracelets that are totally flat and have ONLY rounded edges- the bracelet part is actually interchangeable. I bought three different bands. I would definitely take a look at the site. They had some really cool options I'd not ever seen before.
You can also just run a search under Medic Alert bracelets and you'll get hits for a number of different companies that manufacture products. :)
OH: there is one downside to StickyJ- they don't have any type of database for emergency personnel to access. The only information they will have is what you have engraved on your alert tag and/or what you or a loved one tell them.