I think I can, I think I can....I just won't.

I cannot take this anymore. It seems like the new management has pre-decided that she doesn't like any of the current employees and that we're all pretty much worthless. We're on a supposed "30 day probation," which in my opinion is bullshit. My thing is, if you don't like my performance, tell me so that I can improve. The new manager has even said "Don't come to me with a problem unless you have a solution to suggest," so why can't we have the same courtesy applied to us? Also, how can you change around everything we're doing, basically making us re-learn our jobs, as well as giving us more responsibilities, and expect immediate optimum performance? Aside from that, I'm having a conscience problem. My job is basically to promote a product which I feel is inferior. Granted, I do get customers that know exactly what they are buying and are content with that, but I can't push something and lie to someone when I know it's not true.
I can't work in an environment like this any longer, but I'm no quitter. Not only that, I know how sketchy it looks to quit a job before you have one. So what do I do? I'd leave properly, with notice and all. I wouldn't just walk out or not show up, although I am tempted every day on an hourly basis. Those of you with more "real world" experience than I have, what would you do? It's soaking up my sanity and it's affecting every aspect of my life. I don't know what to do.