In San Jose, it's pretty damn hard to find BHO. Mostly places here sell the co2, which I have been getting recently and it isn't that bad really. Price is $40 a gram which is more than BHO but cheaper than rosin. Rosin here is $40 for a half gram and only one place sells it. But after watching a recent episode of hash church, it shows co2 isn't per sue the cleanest either. You gotta question the type of co2 they are using, where they are obtaining, and if they removed the mystery oil in the co2. Yes it has mystery oil. And then the fats and lipids is a different subject..
I've been using the hair straightener still just to make solventless oil. It's easier cheaper, I can buy 3 grams of hash for $25 and press it all and get almost a gram of oil.