if you but attys and carts from different companies, are they the same? or do different companies/websites make their own versions? if they are different, do you guys have suggestions on the best places to buy attys and carts? or places to avoid? i bought my silverbullet from altsmoke, with 501 carts and attys, and only have 1 atty, would like to buy spares, and i need some more 501 carts, but i think altsmoke was kinda pricey, however, their stuff seems good quality. wondering if i find cheaper ones somewhere else, am i sacrificing quality for price, or is all the stuff the same.