I'm a former heroin addict (9 years clean in August) but I also have severe fibro and can't even stand that long. I'm also job hunting after losing my last job because I went to the hospital (for psych reasons) and had to call off a whole week of work. I've read up and it seems like what I should get is red vein but I have no experience with kratom.
I kinda fell out of it because the same dosage was making me nauseous, but I never felt any physical withdrawals or addictive tendencies. I do have a friend that said he was straight hooked on it but I found it was a great way to ease the aches and pains of middle age while not really getting me buzzed. Even when I first started the high was extremely mild and I kept using it more for the energy, pain relief, appetite suppression and how it seemingly kills my urge to drink. The strains don't really matter all that much imo, if memory serves it's just when they harvest the leaves, I would usually settle on the mixed blend. I'm not sure about how it would affect someone with a previous opiate addiction but it kinda has a built in limiter from letting you abuse it, if I take too much it makes me sick whereas smaller doses give me energy and some mild mood boosting effects.
Aa far as the price I think I spent $200 on a supply that lasted me 6+ months taking a dose twice a day.