I have the Virgin Mobile Marvelc, and ordered one of the duo shields (I chose black/blue) recently. Really like the look of the duo shields, they're a little crazy with the colors but definitely unique. The ones I was looking at on Amazon have good reviews, and though they're listed as T-Mobile I didn't find anything to indicate they wouldn't fit my CDMA version. Will update once I receive the case!
Can't post links yet, but searching "wildfire s duo shield" on Amazon should give you a good idea.