So the rioaudio website is woefully lacking in replacement parts. I wonder if anyone here has knowledge of where to find the headphones to buy separately for the Karma and Cali??

Um, you can use any headphones you want. The Karma came with off-the-shelf Seinheisers. Other discussions on this BBS have been about people's favorite headphones, check into those. Honestly, most portables come with crap headphones, and even though the Karma was the one whose included headphones came the closest to being genuinely good, but you can still do even better.

Doh! I just realized how silly I sounded. I don't like any of the crap headphones I've ever bought but the ones for my Cali are really comfy for running. However the wire has stripped bare at the plug from all the running and I would like to get the exact same pair again. I also really like the Karma ones and I want another pair of those headphones for another portable I have.

I don't have the exact model number of the Seniheisers that came with the Karma, perhaps someone else does. Also, look into those Sony EX71LP Fontopia headphones that we all rave about.

My Karma's got a pair of Sennheiser MX300 earbuds.