instead of tank based I heard people building their own vapors but using cotton instead of tanks for the juice what providers supply this?
It sounds like you're talking about an RDA or "Rebuildable Dripping Atomizer." The "rebuildable" part means you make your own coil (although there are rebuildable tank atomizers as well, called RTA's -- all of them together are called RBA's for "ReBuildable Atomizer") and the "dripping atomizer" part means that instead of a tank reservoir to hold your juice, you just open it up and put drops of juice directly onto the wick and coil (the wick often, but not always, being made of cotton). You'll get somewhere from "a few" to "several" hits off of this, depending on everything from your style of build, to the size of the atomizer's "juice well," before the wick dries out and you need to reapply more juice.
If you don't mind a long wait shipping from China, check out
FastTech for a great selection of affordable clone RDA's. If you find something you really like, and want to support its creators you can go ahead and buy an authentic one for 10x as much from wherever they make them, but clones are a great way to try things out first before you invest in something you're not sure you'll like. Or, if you don't care about the whole clone vs. authentic issue, they're a great way to try out lots of different models, without breaking the bank.