So the other day I had a chance to try an Alair pen with Girl Scout Cookies and I actually found it pretty nice. I really liked the size and discreetness, but I'm not sure they're the best bang for my buck. I saw some Clear Life, Erba mate and Happy Face stuff on the same site as well and I was curious what the opinion was on those. Are these pens in general worth it? Or is there a better/cheaper way to vape concentrates? If I were to try and make my own, what kind of process am I looking at? Is it difficult? Basically I'm looking for something as discrete as the Alair I tried, both for size/smell. I just need something for on the go that maintains a fairly high level of discreetness since I've already got vapes for my flower.

I'm sorry if some of my questions have been answered before, I probably missed such posts when googling. Appreciate the help everyone.