They have ads posted for it, but I couldn't get a good look. I believe they are disposable and cost $9.99, look to be a slim style. What is that a 302? Maybe, just maybe a disposable 510? I have my set up working pretty well so didn't want to waste $10 on curiosity. I mean, I did just give them $60 for gas! Either way, it looks like we are one step closer to the mainstream!