If you want to lower your cost even more, grow your own and buy a heat press to make your own live rosin. No solvents and the terpene profile is preserved.
Now for the hard part: vaping is still bad for you. Most people rip on their dabs like they are smoking flower, looking for big clouds, which is a big no-no. I personally take small pulls with extra air so it isn't so concentrated on each hit. I'd rather not prematurely give myself COPD.