Mobster:

You can buy either or. lately it's been a shake here (in a can) a shake there as I can afford it. It is much for affordable to buy the powdered stuff but it has kind of a grainier texture to it and not as sweet so I generally add splenda. It is still pretty tasty stuff tho'.

You can have them in induction but in some people it stalls their weight loss so to be on the safe side I would buy one or two in a can to test it out and make sure it's not gonna stall you and that you'll actually like it.