I bought one from daydeal.com about 3 weeks ago and had to return it. It was advertised for the Diamond Touch, but what it didn't say is that it was for the GSM version, NOT the CDMA version.
Since then when I think I've found one online, even though the ad says "Diamond" I describe my situation to them and ask them to please verify this works on a Sprint Diamond CDMA version. So far, those that responded back, all said 'oh... it's for the GSM'
The only one I've found has been the sleek one that HTC makes that runs about $60 and I'm pretty sure (me thinks!) this is a link to one:
http://www.windowsmobilenow.com/us/p....aspx?i=169488
You have to really grill them and even then you're not quite sure. I had one retailer first answer saying it was for the Sprint Diamond but when I pressed him to verify, he admitted it probably wasn't.
Hope this helps.