How's it going icecolled?! And welcome! I ordered my m602c from onlyecigs[dot]com. I'm in Los Angeles and it took me about a week. It seems like forever. They made a mistake on my my order, but an email, and a 2am skype call fixed that. They shipped me my missing pcc and threw in a discounted+free shipping PT.
You can buy m602c cartos from donttouchmybutt [dot]com. They purportedly have custom carts for their m602c but it should fit (no poly fill, probably nylon? supposed to be better). They're in the US. I haven't used them so I can't comment.
Also, KR808D-1 cartomizers fit the m602c. I can attest to this as I'm trying CE2-R4 carts at the moment. You can get these at a number of retailers listed here and elsewhere (regular KR808 cartos). Whether you want to get these is up to you. I've read somewhere that they burn easier than m602 carts for lack of coil insulation.
I have a few tips for you that I wish I knew getting into things with my m602c.
1st: i suggest a PCC. Batteries don't last longer than an hour, if you vape moderately to lightly.
2nd: notice the taste of your first few puffs, and be aware if you start noticing a strange plasticy smell/taste. The filler IS BURNING! It's easy to happen so be aware. I thought "wow! Mad vapor and throat hit". It's because I was smoking filler.
3rd: When filling these cartos up (at least the onlyecig ones), the condoms that come with them are shorter than the kr808 ones you see in videos. Count the drops, fill it only half way and do it multiple times if you must. DON'T overfill. It'll over saturate the inner liner of the carto and it won't wick properly. This leads to burning it out, but your cart being full, which means lost
juice, and lost carto because once it burns enough you can't get that taste out. 15 to 17 drops seems safe. A bit slower with VG than PG on the filling.
In general keep the carto moist!
4th: Let your newly filled cartos sit for at least 20 minutes. This ensures that the
juice gets to the inner filler and you don't burn the carto. Otherwise you have juice in there but still burn.
I think that's about it. Sorry for being long winded, and just dishing advice, but I wish someone would've told me this stuff a few weeks ago.
Good Luck, and happy
vaping!