slant eyes

i've searched high and low. I have even pestered people at work. But it seems everytime i buy a piece of wood, ie 2 x4, 2 x 6, and 2 x 8, it just warps the hell out of itself. prior to buying it, i spend the time to look at it and compare it to the others making sure it's as straight as possible. I get home and store it on top of other bits of wood being used as chocks to keep off the ground, thinking the moisture from the ground gets it warped. I tried keeping them stacked so that the weight alone keeps them straight, but they always warp up. does someone have any ideas or suggestions on how to pick/buy/keep wood straight?

or am i just buying the wrong type?

thanks in advance

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