The stacker 3 and 2 I've seen in stores are all now ephedera free. In fact it can be hard to get ephedera stackers unless you order online.

Reading the ingredients on stacker 2 and 3 I'm pretty much just seeing large amounts of caffine. Almost all the ingredients in those you can get seperatly and suppliment. It means taking a few more pills, but is a heck of alot cheaper.