http://www.ebay.com/itm/GENUINE-GM-R...964533&vxp=mtr
http://www.ebay.com/itm/GENUINE-GM-R...2 36723&rt=nc
I'm assuming those are the ones you've already found. Those are all I've really ever seen. I stalk ebay for H2 parts and what not multiple times a day along with craigslist alerts on my phone when new adds pop up.
I find it strange that you can't replace just the handle since you can buy aftermarket billet handles. There must be some way to replace it. I guess you could always buy a billet handle and have it PC'ed black or spray it black yourself.