I've done most of my stands with the higher-grade 2x4s and 2x3s at Home Depot/Lowes. Supposedly they are kiln dried, but I'm somewhat skeptical about that.
You might have to poke around the pallet a bit, but I've usually managed to find some decent pieces (plus, for most stands, you really only need a couple of 8' boards). Also, the whole piece doesn't need to be perfect, it just has to have good sections that you can cut up into the parts you need.
And to echo what GraphicGr8s said above; I'm fairly certain a 2x2 would be plenty strong enough if the stand is built correctly, but I wouldn't want to deal with trying to put fasteners in that small of a piece of wood.