For people who want to use RDTA's and RTA's, there is a company called Coilology that sells premade coils. You can't get them as cheaply as making your own but they you can get a variety pack of 42 premade coils for $15.99:
https://www.vapordna.com/Coilology-P...1-p/coil71.htm
Might be a decent way to get into making your own. Here's a sale of packs of 2 for $4.95:
https://www.elementvape.com/coilolog...prebuilt-coils
I know that this is substantially more expensive than making your own. Looks like a decent bridge in the process though.