The company Mediband also make them. There are probably many others. The silicone ones are the least expensive from what I've found and I guess they're quite practical being washable or able to be disinfected easily, yet waterproof, non allergenic and non toxic etc, but my problem is that I don't find them very attractive.

I need to wear one on my left arm although I am lazy and forget mostly (No BP or needles). I thought about making my own with miniature alphabet beads or with a glass enamelled tag with an alert symbol. The alert symbol would send a medic to a wallet with more detailed information, for example. I figure if I need to wear a bracelet it needs to look nice and I don't like any of the ones that are available.

You could also check Etsy and Ebay.