Amazon spam

Is it just me, or does Amazon need to at least add an account option to opt out of the nonsense spam leaflets they send with every purchase you make? I just ordered a CD (the new Go! Team album, which is every kind of awesome) and got 3 ad leaflets along with the CD. They're getting quite annoying and it's just wasted paper. At least email spam only wastes your time and temper, not trees (though if both kinds could end, that'd be just spiffy).